Martin Audio MA2.8s (ETL) User manual

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
1
CONTENTS (ENGLISH) Page No
1CONTENTS MA2.8s USER GUIDE 1
2APPROVALS 2
3WARNINGS 2
3.1 EXPLANATION OF GRAPHICAL SYMBOLS 2
3.2 WARNING 2
3.3 CAUTION 2
3.4 IMPORTANT SAFETY INSTRUCTIONS 2
3.5 USER RESPONSIBILITY 3
3.5.1 LOUDSPEAKER DAMAGE 3
3.5.2 LOUDSPEAKER OUTPUT HAZARD 3
3.5.3 RADIO INTERFERENCE 3
4INTRODUCTION 4
4.1 UNPACKING 4
4.2 FRONT PANEL 4
4.3 REAR PANEL 5
5REAR PANEL FEATURES 6
5.1 GAIN SWITCH 6
5.1.1 GAIN 6
5.1.2 SENSITIVITY 6
5.1.3 OPTIONS 7
5.2 LINK SWITCH 7
5.3 OPERATING MODES 7
5.3.1 STEREO MODE 7
5.3.2 NOTES FOR AMPLIFIER TESTING 7
5.3.3 TANDEM MODE 8
5.3.4 BRIDGE MONO MODE 8
5.3.5 BRIDGE MONO MODE FEATURES 8
5.4 IMPEDANCE MATCHING (MLS SWITCH) 9
5.4.1 THE MLS TECHNOLOGY 10
5.4.2 THE PROBLEM 10
5.4.3 THE SOLUTION 10
6INSTALLATION 10
6.1 MOUNTING 10
6.2 COOLING 10
6.3 OPERATING VOLTAGE 11
6.4 DENMARK 11
6.5 SWITZERLAND 11
6.6 GROUNDING 11
6.7 POWER CONSUMPTION 11
6.7.1 CALCULATION 12
7CONNECTIONS 13
7.1 INPUT CONNECTIONS 13
7.1.1 BALANCED INPUTS 13
7.1.2 UNBALANCED INPUTS 13
7.2 CONNECTING SPEAKERS 14
8OPERATION 15
8.1 OPERATING PRECAUTIONS 15
8.2 POWERING UP – SOFT START 15
8.3 INPUT ATTENUATORS 15
8.4 INDICATORS 15
9PROTECTION FEATURES 16
9.1 OUTPUT LIMITER 16
9.2 THERMAL PROTECTION 16
9.3 VHF PROTECTION 16
9.4 SHORT CIRCUIT PROTECTION 16
9.5 AC MAINS VOLTAGE PROTECTION 16
9.6 DC. PROTECTION 17
10 MAINTENANCE 17
10.1 TROUBLESHOOTING 17
11 WARRANTY 18
12 SPECIFICATIONS MA2.8s 19
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
2
2APPROVALS
This equipment is tested and approved to the U.S. safety standard ANSI/ UL 6500 and Canadian safety standard
CSA E60065-00 by ITS ETL SEMKO they are a Nationally Recognized Testing Laboratory (NRTL).
The ETL Listed Mark is recognized by local inspectors and
Authorities Having Jurisdiction (AHJs) throughout North America
and also in some areas of South America. ITS ETL SEMKO is a
NRTL recognized by OSHA (Occupational Safety and Health
Administration), the ETL Listed Mark is an accepted alternative
to UL and, as such, inspectors and AHJs are required by law to
recognize, acknowledge, and accept the mark as proof of
product compliance.
3WARNINGS
3.1 Explanation of graphical symbols
The lightning symbol within a triangle is
intended to alert the user to the presence of
lethal voltages within the amplifier that are of sufficient
magnitude to constitute a risk of electric shock to
humans.
The exclamation mark within a triangle is
intended to alert the user to the presence of
important operating and service instructions in the
literature accompanying the product.
3.2 WARNING
To reduce risk of fire or electric shock, do not expose
this apparatus to rain or moisture.
3.3 CAUTION
To reduce the risk of fire or electric shock, do not
remove screws. There are no user-serviceable parts
inside this amplifier. Refer servicing to qualified
personnel only.
3.4 Important Safety Instructions
Before using your amplifier, please read the operating instructions and the safety suggestions
1. Keep this manual for future reference.
2. Do not operate the amplifier if liquid ingress is suspected.
3. Do not stand water or any other liquid on, or near the amplifier.
4. Do not use this amplifier near water. Do not operate the amplifier if wet or standing in liquid.
5. Clean only with dry cloth.
6. Do not block the air intake or exhaust ports. Always install the unit in accordance with the instructions.
7. Do not operate the amplifier on or near any source of heat, such as radiators, lighting dimmer racks, or other
apparatus that produce heat.
8. Always operate the amplifier with the chassis ground wire connected to the electrical safety earth. Do not
tamper with the electrical safety earth, it is provided for your safety. A grounding type plug is fitted; this has
two pins and a third grounding prong. If the plug provided does not fit your mains outlet, consult an electrician
or a competent person to replace the fitted plug. See page 8 section 6.3 for wiring colour code
9. Connect only to AC power outlets rated 230 - 240V (or 100 - 120 V), 50-60Hz.
!
!
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
3
!
'RQRWXVHWKLVDPSOLILHULIWKHPDLQVFDEOHLVGDPDJHGRUIUD\HGSDUWLFXODUO\FKHFNZKHUHWKHPDLQVFDEOH
H[LWVWKHDPSO L I L H U  D Q G  W K H  P D L Q V  S O X J   3 U R W H F W  W K H  P D L Q V  F D E O H  I U R P  E H L Q J  Z D O N H G  X S R Q  R U  U R O O H G  R Y H UE\
KHDY\REMHFWV
Q O \  X V H  D F F H V V R U L H V  V S H F L I L H G  E \  W K H  P D Q X I D F W X U H U 
7KHDPSO L I L H U  L V  L Q W H Q G H G  W R  X V H  L Q  D    ´  U D F N   ) R O O R Z  W K H  P R X Q W L Q J  L Q V W U X F W L R Q V   : K H Q  U D F N V  Z L W K  Z KHHOVDUH
XVHGXVHFDXWLRQWRDYRLGLQM X U \  I U R P  W L S S L Q J  Z K H Q  L Q  P R W L R Q 
8QSOXJWKLVDSSDUDWXVGXULQJOLJKWQLQJVWRUPVRUZKHQXQXVHGIRUORQJSHULRGVRIWLPH
'RQRWFRQQHFWDQDPS O L I L H U  R X W S X W  L Q  S D U D O O H O  R U  V H U L H V  Z L W K  D Q \  R W K H U  D P S O L I L H U ¶ V  R X W S X W   ' R  Q R W  F R Q Q HFWWKH
DPSOLILHURXWSXWWRDQ\  R W K H U  Y R O W D J H  V R X U F H   V X F K  D V  D  E D W W H U \   P D L Q V  R X W O H W   R U  S R Z H U  V X S S O \   U H J D UGOHVVRI
ZKHWKHUWKHDPSOLILHULVWXUQHGRQRURII
'RQRWUXQWKH  R X W S X W  R I  D Q \  D P S O L I L H U  E D F N  L Q W R  D Q R W K H U  F K D Q Q H O  V  L Q S X W 
5HIHUDOOVHU Y L F L Q J  W R  T X D O L I L H G  S H U V R Q Q H O  R Q O \   6 H U Y L F L Q J  L V  U H T X L U H G  Z K H Q  W K H  D S S D U D W X V  K D V  E H H Q  G DPDJH G 
LQDQ\ZD\VXFK D V 
%0DLQVFDEOHRUSOXJ L V  G D P D J H G 
%/LTXLGKDVHQWHUHGWKHDPSOLILHU
%$QREMHFWKDVIDOOHQLQWRWKHXQLW
%7KHDPSOLILHUKDVEHHQH[SRVHGWRUDLQRUPRLVWXUH
%7KHDPSOLILHUGR H V  Q R W  R S H U D W H  Q R U P D O O \
%7KHDPSOLILHU  Z D V  G U R S S H G  R U  W K H  H Q F O R V X U H  L V  G D P D J H G 
'RQRWUHPRYHWRSRUERWWRPFRYHUV7KHUHDUHQRXVHUVHUYLFHDEOHSDUWVLQVLGHWKHDPSOLILHUUHPRYDORIWKH
FRYHUVZLOOH[SRVHKD]DUGRXVYROWDJHVDQGPD\YRLGWKHZDUUDQW\
$QH[SHULHQFHGSHUVRQVKRXOGDOZD\VVXSHUYLVHLQH[SHULHQFHGDGXOWVRUPLQRUVZKHQXVLQJSURIHVVLRQDO
DXGLRHTX L S P H Q W 
3.5User responsibility
/RXGVSHD N H U  G D P D J H
<RXUDPSOLILHULVYHU\SRZHUIXODQGFDQEHSRWHQWLDOO\GDQJHURXVWRERWKORXGVSHDNHUVDQGKXPDQVDOLNH0DQ\
ORXGVSHDNHUVFDQEHHDVLO\GDPDJHGRUGHVWUR\HGE\RYHUSRZHULQJHVSHFLDOO\ZLWKWKHKLJKSRZHUDYDLODEOH
IURPDEULGJHGDPSOLILHU$OZD\VFKHFNWKHORXGVSHDNHU¶VFRQWLQXRXVDQGSHDNSRZHUFDSDELOLWLHV
(YHQ ZKHQXVLQJWKHDPSOLILHU¶VIURQWSDQHODWWHQXDWRUVWRUHGXFHWKHJDLQLWLVVWLOOSRVVLEOHWRUHDFKIXO O  R X W S X W  S R Z H U 
LIWKHLQSXWVLJQDOOHYHOLVKLJKHQRXJK

/RXGVSHDNHURXWSXWKD]DUG
3RZHUDPSOLILHUVDUHFDSDE O H  R I  S U R G X F L Q J  K D ] D U G R X V  R X W S X W  Y R O W D J H V   7 R  D Y R L G  W K H  U L V N  R I  H O H F W U L F  V K RFNGR
QRW WRXFK DQ\ H[SRVHG ORXGVSHDNHU ZLULQJ ZKHQ W K H  D P S O L I L H U  L V  R S H U D W L Q J  6HH SD J H   &RQQHFWLQJ
ORXGVSHDN H U V 
5DGLRLQWHU I H U H Q F H
$VDPSOH R I  W K L V  S U R G X F W  K D V  E H H Q  W H V W H G  D Q G  F R P S O L H V  Z L W K  W K H  O L P L W V  I R U  W K H  ( X U R S H D Q  ( O H F W U R  0 D J Q H W L F  & R P S D W L E L O L W \
(0& GLUHFWLYH 7KHVH OLPLWV DUH GHVLJQHG WR SURYLGH UHDVRQDEOH SURWHFWLRQ DJDLQVW KDUPIXO LQWHUIHUHQFH IURP
HOHFWULFDOHT X L S P H Q W   7 K L V  S U R G X F W  X V H V  U D G L R  I U H T X H Q F \  H Q H U J \  D Q G  L I  Q R W  X V H G  R U  L Q V W D O O H G  L Q  D F F R U GDQFHZLWKWKHVH
RSHUDWLQJ LQVWUXFWLRQV PD\ FDXVH LQWHUIHUHQFH WR RWKHU HTXLSPHQW VXFK DV UDGLR UHFHLYHUV &RPSOLDQFH ZLWK WKH
(0&GLUHFWLYHGRHVQRWDXWRPDWLFDOO\JXDUDQWHHQRQGLVWXUEDQFHRIVXVFHSWLEOHHTXLSPHQWLQFORVHSUR[LPL W \  W R  W K L V
DPSOLILHU
,IWKLVHTXLSPHQWLVVXVSHFWHGRIFDXVLQJLQWHUIHUHQFHWKLVFDQEHHDVLO\FKHFNHGE\SRZHULQJWKHDPSOLILHURQDQGRII
WKHXVHUFDQFRUUHFWWKHLQWHUIHUHQFHE\RQHRUPRUHRIWKHIROORZLQJPHDVXUHV
%5HRULHQWDWHRUUHORFDWHWKHUHFHLYHU¶VDQWHQQD
%,QFUHDVHWKHGLVWDQFHEHWZHHQWKHDPS O L I L H U  D Q G  W K H  H I I H F W H G  H T X L S P H Q W
!
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
4
%&RQQHFWWKHPDLQVFDEOH WRDVRFNHWRQD GLIIHUHQWFLUFXLWIURPWKDWWRZKLFKWKHDIIHFWHGHTXLSPHQWLV
FRQQHFWHG
%&KHFNLIWKHDIIHFWHG  H T X L S P H Q W  F R P S O L H V  Z L W K  W K H  ( 0 &  O L P L W V  I R U  L P P X Q L W \    & (  O D E H O O H G    , I  Q R W   D G G UHVV
WKHSUREOHP  Z L W K  W K H  P D Q X I D F W X U H U  R U  V X S S O L H U   $ O O  H O H F W U L F D O  S U R G X F W V  V R O G  L Q  W K H  ( &  P X V W  E H  D S S URYHG
IRULPPXQLW\DJDLQVWHOHFWURPDJQHWLFILHOGVKLJKYROWDJHIODVKHVDQGUDGLRLQWHUIHUHQFH
%&RQVXOW\RXUGHDOHURUDQH[SHULHQFHGHQJLQHHUWHFKQLFLDQIRUKHOS
4INTRODUCTION
7KDQN\RXIRUSXUFKDVLQJ D0DUWLQ$XGLRSRZHUDPSOLILHU7KLVPDQXDOFRQWDLQVLPSRUWDQW LQIRUPDWLRQRQRS H U D W L Q J
\RXU DPSOLILHU FRUUHF W O \  D Q G  V D I H O \   3 O H D V H  W D N H  V R P H  W L P H  W R  U H D G  W K L V  P D Q X D O  D Q G  I D P L O L D U L ] H  \ R X U V H OI ZLWKWKH
DGYDQFHGIHDW X U H V  R I  W K L V  D P S O L I L H U 
4.1Unpacking
(DFK 0DUWLQ $XGLR0$ V H U L H V  D P S O L I L H U  L V  E X L O W  W R  W K H  K L J K H V W  V W D Q G D U G  D Q G  W K R U R X J K O \  L Q V S H F W H G  E H I R UHLWOHDYHVWKH
IDFWRU\$IWHUXQSDFNLQJ WKH XQLWH[DPLQH LWFDUHIXOO\IRUDQ\VLJQVRIWUDQVLWGDPDJHDQG LQIRUP \RXUGHDOHULI VXFK
GDPDJHLVIRXQG,WLVVXJJHVWHGWKDW\RXUHW D L Q  W K H  R U L J L Q D O  S D F N D J L Q J  V R  W K D W  W K H  X Q L W  F D Q  E H  U H S DFNDJHGDWDIXWXUH
GDWHLIQHFHVVDU\
3OHD VHQRWHWKDW0DUWLQ$XGLRDQGLWVGLVWULEXWRUVFDQQRWDFFHSWUHVSRQVLELOLW\IRUGDPDJHWRDQ\UHWXUQHGSURGXFW
WKURXJKWKHXVHRIQR Q    D SSURYHGSDFNDJLQJ
4.2Front Panel
-40dB
PROTECT
CLIP
ON
PROTECT
CLIP
-40dB
ON
MA2.8s 0
1
17 34278
256
&DUU\ S U R W H F W L R Q  K D Q G O H
%RWKKDQGOHVFDQEHXVHGWRFDUU\WKHDPSOLILHUWKH\DOVRDFWDVSURWHFWLRQIRUWKHIURQWSDQHO,QIL[HGLQVWDOODWLRQVRU
ZKHUHUDFNIURQWFRYHUVDUHWRRVKDOORZWKH\PD\EHUHPRYHGE\XQVFUHZLQJWKHUHWDLQLQJEROWVEHKLQGWKHIURQW
SDQHO
,QSXWOH HODWWHQXDWRUV
7KHVHFRQWUROVDUHXVHGWRVHWWKHVLJQDOOHYHOHQWHULQJWKHDPSOLILHU7KH\DUHFDOLEUDWHGLQG%VWRDVVLVWWKHVHWXSRI
DFWLYHORXGVSHDNHUV\VWHPV6HHSDJH
3URWHFWLQGLFDWRU/('
7KLVLQGLFDWRU  L O O X P L Q D W H V  L I  W K H  D P S O L I L H U  D W W H P S W V  W R  I X Q F W L R Q  D E R Y H  L W V  P D [ L P X P  R S H U D W L Q J  W H P S H U DWXUH

&7KH
LQGLFDWRUILUVWFRPHVRQDVDZDUQLQJWRHLWKHUWXUQGRZQWKHLQSXWOHYHORU  F K H F N  W K H  F R R O L Q J  D U U D Q JHPHQ W V   D I W H U  Z K L F K 
SRLQWWKHDPSOLILHU  Z L O O  P X W H  W K H  L Q S X W  V L J Q D O   : K H Q  W K H  F R R O L Q J  I D Q V  K D Y H  U H W X U Q H G  W K H  R X W S X W  K H D W  V LQNVEDFNWRWKH
QRUPDORSHUDWLQJWHPSHUDWXUHWKHLQSXWVLJQDOLVXQPXWHG
7KLVLQGLFDWRU  D O V R  L O O X P L Q D W H V  Z K H Q  V L J Q D O V  D E R Y H     N + ]  D W  I X O O  S R Z H U  D U H  G H W H F W H G  D W  W K H  R X W S X W  WHUPLQDOVRULIWKH
VKRUWFLUFXLWSURWHFWLRQLVDFWLYDWHG   6 K R X O G  W K L V  R F F X U  W K H  L Q S X W  V L J Q D O  L V  P X W H G   D Q G  W K H  S U R F H V V  U H S H D W V  X Q W L O  W K H  9 + ) 
VLJQDOLVQRORQJHUSUHVHQW6HHSDJH6
&OLSOLPLWLQGLFDWRU
7KLVLQGL F D W R U  V L J Q D O V  Z K H Q  W K H  D P S O L I L H U  R X W S X W  L V  F O L S S L Q J  R U  O L P L W L Q J   , W  K D V  W Z R  G L I I H U H Q W  L Q G L F D W L R Q  V W D W H V 
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
5
,IWKHFOLSOLPLWHULVHQJDJHGLWKDVDVKRUWWLPH F R Q VWDQWDQGLWLOOXPLQD W H V  E U L H I O \    6 H H  S D J H  6
,IWKHFOLSOLPLWHULVQRWHQJDJHGLWKDVDQLQFUHDVHGWLPHFRQVWDQWDQGLWLOOXPLQDWHVIRUDORQJHUSHULRG
6LJQDO  S U H V H Q W LQGLFDWRU
7KLV/(' L O O X P L Q D W H V  D W  ±   G % E H O R Z  I X O O  R X W S X W  V L J Q D O
2QLQGLFDWRU
7KHWZRERWWRPJUHHQ/('¶VLQGLFDWHWKDWWKHRXWSXWFLUFXLWVDUHUHFHLYLQJWKHFRUUHFWUDLOYRO W D J H 
)DQJU L O OHILOWHUV
7ZRJULOOHVZLWKIRDP  I L O W H U V  D U H  O R F D W H G  R Q  W K H  I U R Q W  S D Q H O  W R  S U H Y H Q W  G X V W  I U R P  H Q W H U L Q J  W K H  D P S O LILHU7KHJULOOHVDUH
UHPRYDEOHIRU  H D V \  F O H D Q L Q J  R I  W K H  I L O W H U V  E \  V L P S O \  S X O O L Q J  W K H P  R I I   7 K H  I R D P  I L O W H U V  V K R X O G  D O Z D \ V EH X V H G 
3RZHUVZLWFK
7XUQVPDL Q V  S R Z H U  R Q  R U  R I I 
6HHSDJH  1DQG5
4.3Rear Panel
CH. B CH. AINPUT INPUTCH. A LINKCH.B L INK
GAIN
41dB
38dB
35dB
32dB
29dB
26dB
23dB
20dB
678
123
GAIN
CH .B GAI N CH.A
LINK/ BRIDGEA+B
ON
OFF
Current consumption: 5.2A
230-240V 50-60Hz
1+CH.B+
1- CH.B-
Ser. No :
OUT PUT CH.A
Clip Limiter A
O
n
Off
STEREO
1+CH.A+
1-CH.A-
2+CH.B+
2-CH.B-
BRIDGE
Pin 1+ Spk+
2- Spk-
Pat entsSE 9003426
EP 0483094
US 5200711
Clip Limiter B
On
O
ff
0
-2
-4
-5
MLS switch
dB
MLS switch
OUTPUT CH.B
STEREO
Must be grounded
XLR
Pin 1 Scrn Sleeve
2 Pos Tip
3 Neg Ring
1/4“
Made in the EEC by
MA2.8s
2XWSXW6SHD N HUFRQQHFWRU
7KH6SHDNRQFRQQHFWRUIURP1HXWULNPD\EHXQIDPLOLDUWRVRPHXVHUV$IXOOGHVFULSWLRQLVIRXQGLQWKHRSHUDWLRQ
VHFWLRQ6HHSDJH4
0LQLPXPORDGVH O H F W R U   0 / 6   V Z L W F K 
7KHVHVZLWFKHVDUHXVHGWRVHOHFWWKH P D[LPXPRXWSXWSRZHU6HH10
&OLSOLPLWHUVZLWFK
7XUQVWKHFOLSOLPLWHU´ 1´VZLWFK,1SRVLWLRQRU³ ))´VZLWFK 87SRVLWLRQ6HHSDJH6
,QSXWVLJQ D O  ; / 5 1HXWULN&RPELMDFNIHDWXUHVDOVR1/4´756SKR Q HMDFNV3LQLV³KRW´VHHSDJH3
/LQN,QSXW;/5PDOHFRQQHFWRUFRQQHFWHGLQSDUDOOHOWRWKHIHPDOHIRUOLQNLQJWKHFKDQQHOWRDQRWKHULQSXW
*DLQVZLWFKFKDQQHO%7KUHHRIWKHVZLWFKHVLQWKH',3VZLWFKVHOHFWVWKHPD[LPXPJDLQRIWKHFKDQQHO  W R  E H 
HLWKHURUG%6HHSDJH
/LQNDQG3R O D U L W \  U H H U V H  V Z L W F K 7ZRRIWKHVZLWFKHV  L Q  W K H  ' , 3  V Z L W F K  D U H  X V H G  I R U  / L Q N  D Q G  % U L G J H  R S H U D W L R Q 
6HHSDJ H  
*DLQVZLWFKFKDQQHO$7KUHHRIWKHVZLWFKHVLQWKH',3VZLWFKVHOHFWVWKHPD[LPXPJDLQRIWKHFKDQQHO  W R  E H 
HLWKHURUG%6HHSDJH
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
6
!
$&0DLQV  F D E O H    : $ 5 1 , 1 * 
$ODEHOMXVWEHORZWKHPDLQVFDEOHRQWKHUHDURIWKHDPS O L I L H U  L Q G L F D W H V  W K H  V H O H F W H G  $ &  P D L Q V
RSHUDWLQJ ROWDJH&RQQHFW  W K H  P DLQVFDEOHRQO\WRWKH$&VRXUFHUHIHUUHGWRRQWKHODEHO
5REAR PANEL FEATURES
5.1Gain switch

7KHJDLQVZLWFKORFDWHGRQWKHUHDUSDQHOWKHFHQWUDO',3VZL W F K   F K D Q J H V  W K H  J D L Q  L Q S X W  V H Q V L W L Y L W \ RIWKH D P S O L ILHU
7KLVFDQEHXVHIXOZKHQXVLQJORZRUKLJKQRPLQDOLQSXWVLJQDOV0RVWSURIHVVLRQDOPL[LQJFRQVROHVRSHUDW H  D W  D 
QRPLQDOOHYHORIWR  G % X   W K H    G %  J D L Q  S R V L W L R Q  H Q V X U H V  W K H U H  L V  S O H Q W \  R I  I D G H U  P R Y H P H Q W  D Y D L O D E O H   ) R U  V H P L
SURIHVVLRQDOPL[LQJGHVNVRSHUDWLQJDWDQRPLQDOOHYHORIG%RUG%WKHKLJKHUJDLQVHWWLQJVRIWKHDPSOLILHUFDQ E H
XVHG


7KH',3 V Z L W F K
'LIIHUHQW JDLQV DQG IXQFWLRQ FDQ EH VHOHFWHG IRU FKDQQHO $ DQ G  %   E \
DSSURSULDWH VHWWLQJ RI WKH ',3 VZLWFK 6HOHFWLQJ WKH PD[LPXP JDLQ RI WKH
DPSOLILHU LV DOZD\ V  D  W U D G H  R I I  E H W Z H H Q  Q R L V H  D Q G  K H D G U R R P   $  O R Z  J D L Q 
DPSOLILHU DPSOLILHV OHVV RI WKH QRLVH RI  W K H  S U H F H G L Q J  H T X L S P H Q W   P L [ H U 
FURVVRYHU HTXDOL]HU HW F     $  K L J K H U  L Q S X W  O H Y H O  L V  W K H Q  U H T X L U H G  W R  D W W D L Q  I X O O
SRZHU RXWSXW VR WKH KHDGURRP ZLOOEH G H F U H D V H G  R Q  P L [ H U  R U  F U R V V R Y H U
RXWSXWV,QDQ DFWLYHO\GULYHQV\VWHPWKHUHLVXVXDOO\DGHGLFDWHGORXGVSH D N H U
SURFHVVRU RU FRQWUROOHU IRU WKH ORXGVSHDNHU V\VWHP 0RVW ORXGVSHDNHU
PDQXIDFWXUHUVUHFRPPHQG DVSHFLILF JDLQIRU WKH DPSOLILHUVIRU XVH ZLWK WKHLU
FRQWUROOHUV



*DLQ
7KHUHDU H  H L J K W  S R V L W L R Q V  R I  J D L Q  V H O H F W D E O H   I U R P    G %  W R    G %  L Q   G %  V W H S V   7 K H  G L I I H U H Q W  V H W W L Q J VIRUWKH',3
VZLWFKHVDUHOLVWHGLQWKHWDEOH E H O R Z   7 K H  W K U H H  V Z L W F K H V  W R  W K H YHU\OHIWDUHIRUFKDQQHO%DQG  W KHWKUHHWRWKHYHU\
ULJKWDUHIRUFKDQQHO$7KHWZR V Z L W F K H V  L Q  W K H  P L G G O H  V H O H F W  W K H  R S H U D W L Q J  P R G H  R I  W K H  D P S O L I L H U   6WHUHRRU/LQN
%ULGJH$%
6HQVLWL LW\
6HQVLWLYLW\LVWKHOHYHOLQYROWVUPVRUG%XUHIHUUHGWR9UPVWKDWLVUHTXLUHGWR
REWDLQIXOORXWSXWSRZHU$V  W K H  R X W S X W  S R Z H U  Y D U L H V  Z L W K  W K H  O R D G  L P S H G D Q F H   X V X D O O \   
RKPVLVXVXDOO\WDNHQDVWKHUHIHUHQFH%HFDXVHWKH0$VLVHTXLSSHGZLWKDQ0/6
VZLWFKWKHUHDUHQXPHURXVYDULDWLRQVRIRXWSXWSRZHUYHUVXVVHQVLWLYLW\YHUVXVORDG
LPSHGD Q FH
:HUHFRPPHQGFDOFXODWLQJWKHVHQVLWLYLW\LIWKLVLVQHFHVVDU\
$VDJXLGHWKH  W D E O H  E H O R Z  J L Y H VWKHLQSXWOHYHOLQYROWVUPVYHUVXVJDLQIRUIXOOSRZHU
RXWSXW#WKG.+]VLQHZDYH0/6VZLWFKHVLQSRVLWLRQG%
*DLQG%    
,QSXWG%X        
,QSXW9UPV                         
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
7
2SWLRQV
$VWKH ', 3VZLWFK LVUHFHVVHGDVWLFNHUFDQEHSODFHGDFURVVWKHFXWRXWWRSUHYHQWXQDXWKRUL]HGWDPSHULQJ$QRWKHU
RSWLRQLVWRUHPRYH W K H  ' , 3  V Z L W F K   7KLVVKRX O G  R Q O \  E H  G R Q H  E \  D X W K R U L ] H G  V H U L F H  S H U V R Q Q H O  7KLVFRUUHV S RQGV
WRDOOVZLWFKHVVHWWR³RII´LH G%JDLQDQGVWHUHRPRGH
5.2Link switch
7KH/LQNVZLWFKORFDWHGRQWKHUHDUSDQHOWKHFHQWUDO',3VZLWFKLVIRUFKDQJLQJWKHRSHUDWLQJPRGHRIWKHDPSOLILHU
VHHEHORZVHFWLRQ
5.3Operating modes
6WHUHRPRGH
,QWKLVFRQILJXUDWLRQERWKFKDQQHOVRSHUDWHLQGHSHQGHQWO\RIHDFKRWKHU7KLVLVXVHG
IRUDOOFKDQQHORSHUDWLRQVHJELDPSDQ G  V W H U H R   6 W H U H R  P R G H  L V  V H O H F W H G  E \  S O D F L Q J
WKHWZRFHQWUDOVZLWFKHVLQWKHRIISRVLWLRQ'RZQ7KHDWWHQXDWRUVRQWKHIURQ W  S D Q H O
FRQWUROWKHUHVSHFWLYH F K D Q Q H O V  O H Y H O V 
1H HUFRQQHFWHLWKHURXWSXWWHUPLQDOWRJURXQGRULQSDUDOOHO7KHUHFRPPHQ G H G 
PLQLPXP Q R P L Q D O  L P S H G D Q F H   I R U  V W H U H R  R U  W D Q G H P  R S H U D W L R Q   L V    R K P V  S H U  F K D Q Q H O 
1RWHVIRUDPSOLILHUWHVWLQJ
1 7(&KD Q Q H O  %  L V  D O Z D \ V  S R O D U L W \  U H Y H U V H G  R Q  W K H  L Q S X W   D Q G  S R O D U L W \  U H Y H U V H G  E D F N  R Q  W K H  R X W S X W  QFKDQQHO%WKH
SRVLWLYHRXWSXWYROWDJHZLWKUHVSHFWWR9DSSHDUVRQSLQRIWKH6SHDNRQFRQQHFWRU&KDQQHO$LVFRQQHFWHGZLWK
QRUPDOSR O D U L W \   % \  K D Y L Q J  F K D Q Q H O  $  D Q G  %  R S H U D W L Q J  L Q  R S S R V L W H  S R O D U L W \   W K H  H Q H U J \  V W R U D J H  L Q  W K H SRZHUVXSSO\LV
PRUHHIILFLHQW7KLVLVVLJQLILFDQWIRUVLJQDOVEHORZ+]VXEEDVVHWFDQGLPSURYHVWKHSRZHUEDQGZLGWK%HVXUH
WRXVHEDODQFHGLQSX W V  R Q  D O O  P H D V X U L Q J  H T X L S P H Q W   L Q F O X G L Q J  R V F L O O R V F R S H  S U R E H V   L I  \ R X  D U H  E H Q F K  W H V W L Q J 
5HYHUVHRSHUDW L R Q  R I  & K D Q Q H O  % 
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
8
7DQGHPPRGH
,QWDQGHPPRGHFKDQQHO$LQSXWLVOLQNHGWRFKDQQHO%LQSXWHLWKHULQSXWVRFNHWPD\WKHQEHXVHGWRSURYLGHWKHLQSXW
VLJQDO7DQGHPPRGHLVDFWLYDWHGE\SODFLQJWKHWZRFHQWUDOVZLWFKHVDQGLQWKH³ 1´SRVLWLRQ83%RWKLQSXW
DWWHQXDWRU¶VDUHDFWLYHDOORZLQJ\RXWRVHWGLIIHUHQWOHYHOVIRUHDFKFKDQQHO1RWHWKDWRQO\WKHLQSXWVDUHFRQQHFWHGLQ
SDUDOOHO7KLVLV1 7  D  S D U D O O H O  RXWSXWPRGH1H HUFRQQHFWHLWKHURXWSXWWHUPLQDOWRJURXQGRULQSDUDOOHO
<RXFDQXVHWKHUHPDLQLQJ L Q S X W  F R Q Q H F W R U V  W R  S D U D O O H O  R I I  ³ ' D L V \  ±  F K D L Q ´  V L J Q D O V  W R  R W K H U  D P S O L I L H U V
127($OZD\VWXUQRI I  W K H  / L Q N  V Z L W F K  Z K H Q  X V L Q J  W K H  D P S O L I L H U  I R U  % L  D P S L Q J 
%ULGJHPRQRPRGH
%ULGJHPRQRPRGHLVXVHGWRGHOLYHULQFUHDVHGSRZHUWRWKH
ORXGVSHDNHUV8VLQJWKH0$VLQEULGJHPRGHUHGXFHVWKHQXPEHURI
FKDQQHOVIURPWZRWRRQH7KHQRPLQDOLPSHGDQFHRIWKHORDGPXVWEH
PRUHWKDQ    R K P V   6 H W  W K H  / L Q N  E U L G J H  V Z L W F K H V  W R  W K H  ³ Q ´  S R V L W L R Q   8 3 
DQGXVHHLWKH U  R I  W K H  L Q S X W  F R Q Q H F W R U V  $  R U  %   < R X  F D Q  X V H  W K H  U H P D L Q L Q J 
LQSXWFRQQHFWRUVWRFDUU\DSDUDOOHOVLJQDOWRRWKHU  D P S O L I L HUV%RWK$DQG%
OHYHODWWHQXDWRUVPXVWEHLQWKH V D P H  S R V L W L R Q   : H  U H F R P P H Q G  W K H \  D U H 
XVHGLQWKHG%IXOO\FORFNZLVHSRVLWLRQ
7KHORXGVSHDNHUVKRXOGQRZEHFRQQHFWHGWRFKDQQHO$RXWSXW6SHDNRQ
VKRXO G  E H  F R Q Q H F W H G  W R  W K H  >  @  W H U P L Q D O  R I  W K H  O R X G V S H D N H U   D Q G  ±   W R 
WKH>@WHUPLQDO  R I  W K H  O R X G V S H D N H U 
%ULGJHPR Q R  P RGHIHDWXUHV
%ULGJHGPRQRPRGHFRPELQHVWKHSRZHURIWZRRXWSXWFKDQQH O V  L Q W R  R Q H 
7KLVUHVXOWVLQWZLFHWKHYROWDJHVZLQJIRXUWLPHVWKHSHDNSRZ H U  D Q G  M X V W
OHVVWKDQWKUHHWLPHVWKH I X O O  S R Z H U  R I  D  V L Q J O H  F K D Q Q H O 
7KLVLVEHFDXV H  W K H  F R L O  L V  G U L Y H Q  Z L W K  S R V L W L Y H  Y R O W D J H  D W  R Q H  S R O H  D Q G  D Q  H T X L Y D O H Q W  Q H J D W L Y H  YROWDJHDWWKHRWKHU
SROH6R  L I  D Q    R K P V  O R D G  L V  F R Q Q H F W H G  L Q  E U L G J H G  P R G H   R Q H  F K D Q Q H O  V K D U H V  R Q H    R K P V  S D U W  R I  W K H  O R D G   D Q G  W K H 
RWKHUFKDQQHOVKDUHVWKHRWKHURKPVSDUW7KHSRZHULQW R    R K P V  I U R P  D Q  0 $     V   0 / 6  D W   G %   L V  :6RWKH
WRWDOEULGJHGSRZHULQWRWKHRKPVORDG  Z LOOEH[: :
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
9
5.4Impedance matching (MLS switch)
7KH0/6 V Z L W F K H V  D U H  O R F D W H G  R Q  W K H  U H D U  S D Q H O  R I  W K H  D P S O L I L H U   7 K H  0 / 6   0 L Q L P X P  / R D G  6 H O H F W   V Z L W F K H V RIIHU
LPSHGDQFHSRZHUPDWFKLQJVRWKDW\RXFDQGULYHWKH0$VLQWRRKPVZLWKRXWLQFUHDVHGKHDWORVV7KH0$    V
FDQGHOLYHUZDWWVLQWRERWK   D Q G    R K P V   8 V H  K L J K H U  0 / 6  V Z L W F K  S R V L W L R Q V  Z K H Q  F R Q Q H F W L Q J WRORZHU
LPSHGDQFHVDVVKRZQLQ7DEOH$VFDQEHVHHQIURP7DEOHWKH0$VFDQSURGXFHRXWSXWSRZHUVLQ H [ F HVVRI
ZDWWV
0/6SRVLWLRQVFDQEHVHWGLIIHUHQWO\IRUHDFKFKDQQHODQGDYDULHW\RIFRPELQDWLRQVFDQEHDFKLHYHGVHH7DEOH
7DEOH S U R Y L G H V  W K H  V L P S O H V W  Z D \  W R  I L Q G  W K H  E H V W  0 / 6  S R V L W L R Q  I R U  \ R X U  D S S O L F D W L R Q   7 K H U H  L V  Q R  U LVNRIGDPD J L Q J WKH
DPSOLILHUDVLWLVZHOOSURWHFWHGHYHQGRZQWRRKPV,I\RXDUHXQVXUHRUZKHU H  W L P H  G R H V  Q R W  S HUPLW
H[SHULPHQWDWLRQXVHWKHGHIDXOWSRVLWLRQV
7KH0$  V  D P S O L I L H U  L V  D  S R Z H U  F R Q Y H U W H U   D Q G  E \  V H O H F W L Q J  0 / 6  S R V L W L R Q V  \ R X  D U H  D O O R F D W L Q J  D  S R U W L RQRIWKH
ZDWWVRISRZHU
MA2.8s  MLS SWITCH SETTING
LOAD CONFIGURATION -5 dB -4 dB -2 dB 0 dB
16 ohms Stereo (2 channel) 160 w 200 W 340 W 5 2 0 W
8 ohms Stereo (2 channel) 300 W 400 W 700 W 1100 W
4 ohms Stereo (2 channel) 600 W 750 W 1300 W 1500 W
2 ohms Stereo (2 channel) 1200 W1400 W 1550 W 1700 W [1]
1900 W [2] 3000 W [2]
16 ohms Bridged mono 600 W 800 W 1400 W 2200 W
8 ohms Bridged mono 1200 W 1500 W 2600 W 3000 W
4 ohms Bridged mono 2400 W 2800 W 3100 W 3100 W [1]
[1] Component tolerance dependent
[2] Continuous pow er, one channel driven or peak power both channels driven.
(Thermal prot e c t i o n m a y o c c u r a t h i g h c o n t i n u o u s p o w e r ) .
Power in watts (EIA 1 kHz, 1% THD)
7DEOH
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
10
7KH0/6¸¸
¸¸WHFKQRORJ\
0/6VZLWFKHVRQUHDUSDQHO
7KHSURE O H P 
,I\RXDVVXPHWKDWDSRZHU
DPSOLILHUFDQGHOLYHU
ZDWWVLQWRRKPVDQGLV
GHVLJQHGWREHDEOHWRUXQLQWR
RKPV7KHRU H W L F D OO\LW
VKRXOGEH  D E O H WRGHO L Y H U  
ZDWWVLQWRWKHRKPORDG
9HU\IHZ S U R I H V V L R Q D O  S R Z H U
DPSOLILHUVDUHDEOHWRGRWKLV
DVDOOFRQYHQWLRQDOSRZHU
DPSOLILHUGHVLJQVDUHD
FRPSURPLVHEHW Z H H Q  S R Z H U
GLVVLSDWLRQFRVWVVL]HHWF
0RVWDPSOLILHUVFDQGHOLYHURQO\RUOHVVRIWKHLUWKHRUHWLFDO
SRZHULQW R    R K P V   7 K L V  L V  G X H  W R  U H VLVWLYHORVVHVLQWKHSRZHU
VXSSO\DQGWKHXVHRIFXUUHQWOLPLWLQJWRSURWHFWWKHRXWSXW
VHPLFRQGXFWRUGHYLFHV
7KHVROXWLRQ
7KHVROXW L R Q  L V  W R  X V H  D  ³ & R Q V W D Q W  3 R Z H U  & R Q Y H U W H U ´   7 K H  F R Q Y H U W H U  L V  F R Q Q H F W H G  E H W Z H H Q  W K H  S R Z H U  V X S S O \  D Q G  W K H
OLQHDUSRZHUDPSOLILHU7KHPDLQIHDWXUHRIWKH&RQVWDQW3RZHU&RQYHUWHULVWKDWLWFDQSURGXFHPRUHFXUUHQWWKDQLW
WDNHVIURPWKHSRZHUVXSSO\DQGWKLVZD\RYHUFRPHVWKHORV V H V  L Q  W K H  S R Z H U  V X S S O \  Z K H Q  G U L Y L Q J  O R Z  LPSHGDQFHV
$VSRZHULVWKHSURGXFWRIFXUUHQWDQGYROWDJHDQLQFUHD V H  L Q  F X U U H Q W  U H T X L U H V  D  U H G X F W L R Q  L Q  Y R O W D JH7KLVUHGXFWLRQ L Q 
YROWDJHDOVRFDXVHVWKHGLVVLSDWLRQLQWKHRXWSXWGHYLFHVWREHORZHU7KHFXUUHQWOLPLWSURWHFWLRQWKUHVKROG F D Q  E H 
DGMXVWHGIRUDPXFKKLJKHUFXUUHQWVRLWFDQQRWLQWHU I H U H  Z L W K  W K H  U H T X L U H P H Q W  E \  W K H  O R X G V S H D N H U  L PSHGDQFH F X U Y H 
6INSTALLATION
6.1Mounting
7KHDPSOLILHU  L V  W Z R  U D F N  X Q L W V  K L J K    8   D Q G  Z H L J K V    . J     O E V   D Q G  Z L O O  P R X Q W  L Q  D  V W D Q G D U G  ( , $ ´UDFN$PSOLILHUV
PD\EHVWDFNHG  G L U H F W O \  R Q  W R S  R I  H D F K  R W K H U   7 K H U H  L V  Q R  Q H H G  I R U  V S D F L Q J  E H W Z H H Q  X Q L W V   , I  L W  L V  W K HLQWHQWLRQWRILOOD
UDFNZLWKDPSOLILHUVZH U H F R P P H Q G  U D F N L Q J  L V  V W D U W H G  I U R P  W K H  E R W W R P  R I  W K H  U D F N   , W  L V  D O V R  U H F R P P H Q G H GWKDWUHDU
VXSSRUWVDUHXVHGIRUDPSOLILHUVPRXQWHGLQWKHPLGGOHRIWKHUDFNHVSHFLDOO\LIXVHGDVSDUWRIDSR U W D E O H  V \ V W H P 
6.2Cooling
<RXUDPSOLILHUXVHVDIRUFHGDLUFRROLQJV\VWHPWRPDLQWDLQDORZDQGHYHQRSHUDWLQJWHPSHUDWXUH$OOIDQFRR O H G
0$57,1$8', 0$VHULHVDPSOLILHUVKDYHIURQWWRUHDUFRROLQJ1HYHUWU\WRUHYHUVHWKHGLUHFWLRQRIDLUIORZDVWKH
DPSOLILHUQHHGVDSUHVVXUHFKDPEHUEHWZHHQWKHIDQVDQGWKHLQWHUQDOKHDWVLQNDQGWKLVRQO\RSHUDWHVLQRQH
GLUHFWLRQRIWKHDLUIORZ
0DNHVXUHWKHU H  L V  D G H T X D W H  D L U  V X S S O \  L Q  I U R Q W  R I  W K H  D P S O L I L H U   D Q G  W K D W  W K H  U H D U  R I  W K H  D P S O L I LHUKDVVXIILFLHQWVSDFHWR
DOORZWKHH[KDXVWDLUWRHVFDSH,IWKHDPSOLILHULVUDFNPRXQWHGGRQRWXVHFRYHUVRUGRRURQWKHIURQWRUUHDURIWKH
UDFN,IWKHKHDWVLQNWHPSHUDWXUHULVHVWRRKLJKVHQVLQJFLUFXLWVZLOOPXWHWKHKRWFKDQQHO,IWKHSRZ H U  V X S S O \
7\SHRIPRGH 3RZHU,PSHGDQFH
&K$ &K%
&RQYHQWLRQDOPRGH  
 
 
+LJKYROWDJHPRGH 9UPV 9UPV
 

/RDGPDWFKLQJ  
 
 
RZHUVKDULQJ  
 
 
/LPLWHGSRZHU  
 
 
%LDPSPRGH 
 
 
 
7DEOH
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
11
RYHUKHDW V   D Q R W K H U  V H Q V L Q J  F L U F X L W  Z L O O  P X W H  E R W K  R X W S X W  F K D Q Q H O V   X Q W L O  W K H \  F R R O V  G R Z Q  W R  D  V D I H  R SHUDWLQJ
WHPSHUDWXUH
)RULQVWDOODWLRQVZLWKDFHQWUDOFRROLQJV\VWHPXVXDOO\IRXQGLQIL[HGLQVWDOODWLRQVZLWKDGHGLFDWHGUDFNURRPLWPD\EH
QHFHVVDU\WRFDOFXODWHWKHPD[LPXPKHDWHPLVVLRQ5HIHUWR3RZHUFRQVXPSWLRQRQSDJH5HPHPEHUQH Y H U  U D F N
GLIIHUHQWEUDQGVRIDPSOLILHUVWRJHWKHUWKDWKDYHRSSRVLQJDLUIORZFKDUDFWHULVWLFV
6.3Operating voltage
:$51,1*
$ODEHOMXV W  E H O R Z  W K H  P D L Q V  F D E O H  L Q O H W  R Q  W K H  U H D U  R I  W K H  D P S O L I L H U  L Q G L F D W H V  W K H  V H O H F W H G  $ &  PDLQVRSHUDWLQJ
ROWDJH  & R Q Q H F W  W K H  P D L Q V  F D E O H  R Q O \  W R  W K H  $ &  V R X U F H  U H I H U U H G  W R  R Q  W K H  O D E H O   7 K H  Z D U U D Q W \  Z L O OQRWFR H U
GDPDJHFDXVHGE\FRQQHFWLQJWRWKHZURQJW\SHRI$&PDLQV
,IWKHILWWHGPDLQVFRQ Q HFWRULVQRWDSSURSULDWHIRU\RXUFRXQWU\LWFDQEHFXWRIIDQGZLUHGWRDVXLWDEOHFRQQHFWRULQ
WKHIROORZLQJZD\
%/$&.RU  % 5 2 : 1 / , 9 (
:+,7(RU%/8( 1(875$/
*5((1RU*5 ( ( 1  < ( / / 2 : ( $ 5 7 + 
QFHFRQQHFWHG  W R  D  V X L W D E O H  $ &  V X S S O \   W K H  D P S O L I L H U  F D Q  E H  V W D U W H G  Z L W K  W K H  S R Z H U  V Z L W F K   : K H Q  \ R X SRZHUXS  W K H 
DPSOLILHULWWDN H V  D  F R X S O H  R I  V H F R Q G V  W R  V H O I  F K H F N    W K L V  L V  N Q R Z Q  D V  W K H   V R I W  V W D U W   R U   V O R Z  V W D U WVHTXHQFHWKHIDQV
WKHQEORZDWKLJKVSHHGEHIRUHJRLQJLQWRLGOH7KHWZRERWWRPJUHHQ/('¶VWKHQLOOXPLQDWHWRVKRZWKHDPSOLILHULV
RSHUDWLRQDO
6.4Denmark:
1DWLRQDOGHYLDWLRQFRQFHUQLQJLQV W D O O D W L R Q  R I  W K H  0 $    V 
'DQLVKVDIHW\UHJXODWLRQRQO\SHUPLWVWKHXVHRIDQ$PD L Q IXVH$VWKH0$VXVHVDQLQWHUQDOSULPDU\PDLQVIXVH
RI$WKH  0 $    V  P X V W  E H  H T X L S S H G  Z L W K  D Q  L Q G X V W U L D O  P D L Q V  F R Q Q H F W R U  U D W H G  I R U    $  R U  D E R Y H   R U  D VDQDOWHUQDWLYHLW
FDQEHKDUGZLUHGWRD$FDSDFLW\FLUFXLWDQGEUHDNHU
6.5Switzerland:
1DWLRQDOGHYLDWLRQFRQFHUQLQJLQV W D O O D W L R Q  R I  W K H  0 $     V :
6ZLVVVDIHW\UHJXODWLRQVWLSXODWHVWKDWW\SHPDLQVFRQQHFWRUVPXVWEHXVHG
6.6Grounding
7KHUHLVQRJURXQGOLIWVZLWFKRUWHUPLQDO  R Q  W K L V  D P S O L I L H U   7 K H  V L J Q D O  J U R X Q G  L V  D O Z D \ V  I O R D W L Q J  Y L D  D UHVLVWRUWRFKDVVLV
DQGWKHJURXQGLQJV\VWHPLVDXWRPDWLF,IDSRWHQWLDOGLIIHUHQFHDERYH9LVGHWHFWHGEHWZHHQVLJQDOJURXQGDQG
FKDVVLVJURXQGDVKRUWFLUFXLWLVDXWRPDWLFDOO\LQWURGXFHGEHWZHHQWKHWZRHQVXULQJHOHFWULFDOSURWHFWLRQ,IRWKHU
HTXLSPHQW  R U  D P S O L I L H U V  Z L W K L Q  D  V \ V W H P  V K R X O G  G H Y H O R S  D Q  H O H F W U L F D O  I D X O W  W R  H D U W K   W K H  P D L Q V  I X V H  RQWKDWHTXLSPHQW
VKRXOGUXSWXUHGXHWRWKLVDXWRPDWLFV\VWHPDO O R Z L Q J  D Q  H D U W K  F X U U H Q W  W R  I O R Z  I R U  S U R W H F W L R Q  S X U S R V H V
,IKRZHYHU\RXZLVKWRSHUPDQHQWO\FRQQHFWWKHVLJQDOJURXQGWRFKDVVLVHDUWKFRQQHFWWKH;/5FRQQHFWRU¶VVKHOOOXJ
WRSLQ,QWKHLQWHUHVWRIVDIHW\QHYHUGLVFRQQHFWWKHHDUWKSLQRQWKHPDLQVFDEOH.
7RFRPSO\ZLWK&(DSSURYDOUDGLRLQWHUIHUHQFHWKHUHLVDQ$& P D L Q V  I L O W H U   7 K L V  I L O W H U  Q H H G V  W K H  F K DVVLVJURXQGIRU
UHIHUHQFHRWKHUZLVHDFXUUHQWORRSLVIRUPHGYLDWKHVLJQDOJURXQG
1H HUGLVFRQQHFWOLIWWKHPDLQVVDIHW\HDUWK
6.7Power consumption
7KHUHDU H  W K U H H  Z D \ V  W R  G H W H U P L Q H  W K H  S R Z H U  F X U U H Q W  F R Q V X P S W L R Q  R I  W K H  D P S O L I L H U 
)LUVWWKHSHDNFXUUHQWGUDZDWIXOORXWSXWSRZHU8QGHUWKLVFRQGLWLRQWKHSRZHUDPSOLILHUZLOORSHUDWHIRUOHVVWKDQ
PLQX W HVEHIRUHWKHUPDOO\OLPLWLQJRUEORZLQJWKHPDLQVIXVHDQGLVDQXQUHDOLVWLFµQRUPDO¶XVHFRQGLWLRQ7RGHVLJQD
PDLQVGLVWULEXWLRQV\VWHPEDVHGRQWKHFXUUHQWGUDZDWIXOOSRZHUZRXOGUHVXOWLQDQRYHUVSHFLILHGV\VWHP1RPXVLF
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
12
SURJUDPPHPDWHULDO  U H T X L U H V  W K H  I X O O  V W H D G \  V W D W H  F R Q W L Q X R X V  S R Z H U  R I  D Q  D P S O L I L H U   W K L V  R S H U D W L Q J  F R Q GLWLRQLVRQO\
YDOLGIRUDPSOLILHUEHQFKWHVWLQJ
6HFRQGWKHPD[LPXPH[SHFWHGDYHUDJHFXUUHQWXQGHUZRUVWFDVHSURJUDPPDWHULDOZKLFKLVRIIXOOSRZHU
DFFRUGLQJWRWKH)7&VWDQG D U G   $ W  W K L V  O H Y H O  W K H  P X V L F  Z L O O  E H  L Q  D  V W D W H  R I  F R Q V W D Q W  F O L S  D Q G  L V  W K HUHIRUHWKHKLJKHVW
SRZHUOHY H O  W K D W  F D Q  E H  R E W D L Q H G  Z L W K R X W  F R P S O H W H O \  R E O L W H U D W L Q J  W K H  S U R J U D P  P D W H U L D O 
/DVWWKHQRUPDORS H U D W L Q J  S R Z H U    D V  G H I L Q H G  E \  ( 1         , ( &     $ 1 6 ,  8 /       D V  D  P H D V X U H P H Q W  O H Y H OIRU
DSSURYDO  D Q G  W H V W L Q J  W R  W K H V H  V W D Q G D U G V   7 K H  Q R U P D O  R S H U D W L Q J  S R Z H U  L V  P H D V X U H G  X V L Q J  S L Q N  Q R L V H   Z L W K  D Q  D Y H U D J H 
RXWSXWSR Z H U  H T X D O  W R      R I  I X O O  S R Z H U   7 K H  R Q H  H L J K W K  S R Z H U  L V  W K H  P D [ L P X P  O H Y H O  P X V L F  F D Q  E H  U H SOD\HGZLWKRXW
FRQWLQXRXVDPSOLILHUFOLSSLQJWKLVFRUUHVSRQGVWRKHDGURRPRIRQO\G%VZKLFKLVYHU\ORZIRUQRUPDOSURJUDP
PDWHULDO
&DOFXODWLRQ
7KHFXUUHQWGUDZFDQEHFDO F X O D W H G  E \  G L Y L G L Q J  W K H  P D L Q V  L Q S X W  S R Z H U  E \  W K H  P D L Q V  Y R O W D J H 
:HUHFRPPHQG\RXWRGHVLJQWKHSRZHUGLVWULEXWLRQIRUDWOHDVWWKHFXUUHQWDWSRZHUDQGSRZ H U IRUKHDY\
GXW\GHPD Q G V  V X F K  D V  F R Q F H U W  W R X U L Q JDQGLQGXVWULDOPXVLFHWF
7KHKHDWSRZHUFDQEHFDO F X O D W H G  D V  I R O O R Z V 
,IDKHDGURRPILJXUHRIDWOHDVWG%RIIXOOSRZHULVXVHGZLWKDRKPVORDGRQHDFKRXWSXWRIWKHDPSOLILHU7KH
SRZHU  S H U  F K D Q Q H O  L V  W K H Q                 Z D W W V   D Q G  W K H  W R W D O  R X W S X W  S R Z H U     [            Z D W W V 
7KHSRZHUFRQVXPSWLRQDFFRUGLQJWRWKHFKDUWDERYHLVWKHQZDWWV
7KHKHDWSRZHUSURGXF H G LVWKHGLIIHUHQFHEHWZHHQWKHSRZHUFRQVXPSWLRQDQGRXWSXWSRZHU
 ZDWWVWRWDOIRUWKHDPSOLILHU
0$V+($732:(5
3 :(5 3 :(5    3  : ( 5     3  : ( 5     3  : ( 5     3  : ( 5
:$776 .FDOKRXU %78KRXU
 KP      
 KP      
 KP      
3RZH U  O H Y H O   $ Y H U D J H  S R Z H U  Z L W K  P X V L F  D V  S U R J U D P P H  V R X U F H   7 K H  D P S O L I L H U  G U L Y H Q  W R  F O L S  O H Y H O
3RZH U  O H Y H O   1 R U P D O  R S H U D W L Q J  S R Z H U  Z L W K  P X V L F  D V  S U R J U D P P H  V R X U F H    G %  K H D G U R R P 
 2:(5  RZHU  RZHU ,GOH
>:@ QRWH QRWH
0$V RKPV [    
RKPV [    
RKPV [    
QRWH $YHUDJHSRZHUZLWKPXVLFDVSURJUDPVRXUFH7KHDPSOLILHUGULYHQWRFOLSOHYHO
QRWH 1RUPDOPXVLFSRZHUZLWKG%KHDGURRP,(&VWDQGDUGSRZHUUDWLQJ
0$,16,1 87 2:(50$;287 87 2:(5
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
13
7CONNECTIONS
7.1Input connections
%DODQFHGLQSXWV
;/5,QSXWFRQQHFWRUVDUHDFWLYHEDODQFHGDQGZLUHGDFFRUGLQJWRWKH,(&WKDWLVSLQKRWDQGZLUHGLQWKH
IROORZLQJZD\
3,1 *5 81'6+,(/'
3,1 + 7
3,1 & /'

;/5LQSX W  F R Q Q H F W R U ;/5EDOD Q F H G 
:LWKLQWKH1HXWULN&RPERMDFNWKHU H  L VD1/4´     P P   S K R Q H  M D F N   Z K L F K  L V  Z L U H G  L Q  S D U D O O H O  Z L W K  W K H  ; / 5 
7,3 + 7
5,1* & /'
6/((9( 6+,(/'*5 81'

756SOXJ
Must be groundedXLRPin 1 Scrn Sleeve2 Pos Tip3 Neg Ring1/4“
CH. B CH. A INPUT INPUT CH.A LINKCH.B LINK
GAIN41dB38dB35dB32dB29dB26dB23dB20dB678123 GAINCH.B GAINCH. ALINK / BRIDGEA+B ONOFFCurrent consumption: 5.2A 230-240V 50-60Hz Pa tent s SE 9EP 0US 5 STEREO
7KHLQSXWLPSHGDQFHLVKLJKHQRXJKNRKPVEDODQFHGWRDOORZ´GDLV\FKDLQLQJ´RUPXOWLSOHSDUDOOHOLQSXW
FRQ QHFWLRQV7KHKHDGURRPRIWKHLQSXWFLUFXLWVZLOODOVRDFFHSWWKHPD[LPXPRXWSXWOHYHOIURPYLUWXDOO\DQ\ORZOHYHO
VLJQDOVRXUFH%DODQFHGVLJQDOVDUHOHVVVHQVLWLYHWR$&KXPDQGUDGLRLQWHUIHUHQFH7KHVRXUFHLPSHGDQFHVKRXOGEH
OHV VWKDQNRKPVWRDYRLGKLJKIUHTXHQF\ORVVHVLIORQJFDEOHUXQVDUHXVHG
7RGDLV\FKDLQDPSOLILHUVXVHWKH;/5PDOHFRQQHFWRUODEHOHG/LQNSURYLGHGRQHDFKFKDQQHO,WLVFRQQHFWHGLQ
SDUDOOHOZLWKWKH1HXWULN&RPERMDFNRQHDFKLQSXW
8QEDODQFHG L Q S X W V 
7RFRQQHFWDQXQEDODQFHGVRXUFH  W L H  S L Q  ULQJRQ756MDFNGRZQWRWKHVKLHOGRIWKHFRQQHFWRU,I\RXOHDY H  R Q H 
SLQGLVFRQQHFWHG\RXZLOOORVHG%
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
14
$EH WWHUPHWKRGIRUXVLQJXQEDODQFHGVRXUFHVLVVKRZQEHORZ7KLVLVVLPLODUWRWKHFRQQHFWLRQIRUEDODQFHGOLQHVEXW
SLQLVFRQQHFWHGWRWKHVKLHOGDWWKHVRXUFH7KHKXPDQGQRLVHUHMHFWLRQIRUWKHFDEOHLVHTXLYDO H Q WWRWKDWIRUD
EDODQFHGOLQH7RPLQLPL]HKXPLQWKHDXGLR  X V H  E D O D Q F H G  L Q S X W V  Z K H Q H Y H U  S R V V L E O H 
8QEDODQFHGOLQHFRQQ H F W L R Q  %DODQFHGOLQHZLWKXQEDOD Q F H G  H  X L S P H Q W
)RUWZRFKDQQHOVWHUHRRSHUDWLRQXV H  E R W K  F K D Q Q H O V  $  D Q G  %   ) R U  W D Q G H P  V W H U H R  R U  E U L G J H G  P R Q R  R S H U D W L R Q   X V H 
RQO\RQHRIWKHLQSXW V   6 H H  RSHUDWLQJPRGHVIRUPRUHGHWDLOV
7.2Connecting speakers
6SHDNHUFRQQHFWLRQVDUHPDGHYLDWKHWZR1HXWULN1/)&6SHDNRQFRQQHFWRUV7KH6SHDNRQFRQQHFWRULVGHVLJQHG
IRUKLJKSRZH U  O R X G V S H D N H U  X V H  D Q G  P H H W V  D O O  Z R U O G Z L G H  V D I H W \  U H T X L U H P H Q W V 
&RQQHFWLRQV
7KH6SHDNRQVDUHZLUHG
&KDQQHO$
3LQ3LQ  X W S X W  $
3LQ3LQ  X W S X W  %
&KDQQHO%
3LQ3LQ  X W S X W  % 
7KHULJKW6SHDNRQ&KDQQHO$KDVERW K  F K D Q Q H O  $  D Q G  %  R X W S X W V  D Y D L O D E O H   V R  L V  X V H I X O  I R U  E U L G JLQJDQGELDPS
RSHUDWLRQVHHEULGJHGPRQRRSHUDWLRQRQSDJH87KHOHIW6SHDNRQ¸&KDQQHO%FDUULHVRQO\WKHFKDQQHO%RXWSXW
&KDQQHO$DQG %  L Q W R  W Z R  V H S D U D W H
6SHDNRQV
&KDQQHO$DQG %  L Q W R  R Q H  6 S H D N R Q 
6WHUHRDQG%LDPS
%ULGJHGPRQR
1H HUFRQQHFWHLWKHURXWSXWWHUPLQDOWRJURXQGRUWRVRPHRWKHURXWSXWRULQSXWWHUPLQDOVHHZDUQLQJVLQ
FKDSWHU
)RUQRUPDOWZR  F K D Q Q H O  R S H U D W L R Q   F R Q Q H F W  H D F K  V S H D N H U  O R D G  D F U R V V  W K H  R X W S X W ¶ V  S R V L W L Y H  D Q G  Q H J DWLYHWHUPLQDO V 
3D\DWWHQWLRQWRVSHDNHUSRODULW\ORXGVSHDNHUVFRQQHFWHGRXWRISRODULW\GHJUDGHVRXQGTXDOLW\
.HHSWKHORXGVSHDNHUFDEOHVDVVKRUWDVSRVVLEOHDQGXVHDJRRGTXDOLW\VWUDQGHGFDEOH'RQRWXVHVKLHOGHGZLUH
VXFKDVPLFURSKRQHRUJXLWDUFDEOH7KHORXGVSHDNHUFDEOHUHGXFHVWKHSRZHURIWKHDPSOLILHUVLQWZRZD\V
,WLQFUHDVHVWKHORDGLPSHGDQFHDQGLQWURGXFHVUHVLVWLYHSRZHUORVVHV
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
15
:$51,1*7RSUH HQWHOHFWULFVKRFNGRQRWRSHUDWHWKHDPSOLILHUZLWKDQ\RIWKHORXGVSHDNHUFDEO H
FRQGXFWRUVH[SRVHG
8OPERATION
8.1Operating precautions
%0DNHVXUHWKDWWKHSRZHUVZL W F K  L V  V H W  W R  ³ ) ) ´  E H I R U H  F R Q Q H F W L Q J  D Q \  L Q S X W  R U  R X W S X W  R U  R S H U D W L Q J WKH
VZLWFKHVRQUHDUSDQHO6HHSDJHV  DERXWLQVWDOODWLRQ
%0DNHVXUHWKDWWKH$&PDLQVYROWDJHLVFRUUHFWDQGWKHVDPHDVWKHRQHSULQWHGRQWKHUHDUSDQHORIWKH
DPSOLILHU6HHSDJHV1DERXWRSHUDWLQJYROWDJHDQGSRZHUFRQVXPSWLRQ
%0DNHVXUHWKDWWKHVZLWFKHVRQWKHUHDUSDQHOIRURSHUDWLRQPRGHVJDLQVZLWFKFOLSOLPLWHUVDQGWKH0/6
VZLWFKHVDUHLQWKHFRUUHF W  S R V L W LRQ6HHSDJHDERXWRSHUDWLQJ  P R GHVSDJH6DERXWFOLSOLPLWHUVDQG10 IRU
WKH0/6VZLWFKHV
%,WLVDOZD\VDJRRGLGHDWRWXUQGRZQWKHJDLQFRQWUROVGXULQJSRZHUXSWRSUHYHQWVSHDNHUGDPDJHLQFDVH
DKLJKVLJQDOLVSUHVHQWDWWKHLQSXW
8.2Powering up – Soft start

:KHQ\RXSRZHUXSWKH  D P S O L I L H U  L W  W D N H V  D  F R X S O H  R I  V H F R Q G V  W R  F K H F N  L W V  F L U F X L W V   7 K L V  L V  N Q R Z Q  D V  WKH  V R IWVWDUWRU
VORZVWDUW VHTXHQFH 7KH IDQV WKHQ EORZDWKLJK VSHHG EHIRUH JRLQJLQWR LGOHDQGWKH WZRERWWRP JUHH Q  / ( ' ¶ V
LOOXPLQDWHWRVKRZ  W K H  D P S O L I L H U  L V  R S H U D W L R Q D O 
8.3Input attenuators

7KH WZR LQSXWOHYHO DWWHQXDWRUV RQ WKH IURQWSDQHO DGMXVW WKHVLJQDO OHYHOIRU WKHLU UHVSHFWLYH DPSOLILHU FKDQQHO LQ DOO
PRGHV7KH\DUHFDOLEUDWHGLQG%WRKHOSWKHVHWWLQJXSRIDFWLYHORXGVSHDNHUV\VWHPV
,QEULGJHGPRGHERWKFRQWUROVPXVWEHLQWKHVDPHSRVLWLRQVRWKDWWKHVSH D N H U  O R D G  Z L O O  E H  V K D U HGHTXD O O \  E H W Z H H Q 
WKHFKDQQ H O V 
8.4Indicators
7KHWZRERWWRPJUHHQ´ 1´/('¶VLQG L F D W L Q J  W K D W  W K H  R X W S XWFLUFXLWVDUHUHFHLYLQJWKHFRUUHF W  U D L O  Y R O W D JH
7KH´G%´/('¶VLOOXPLQDWHLIWKHRXWSXWVLJQD O  L V  J U H D W H U  W K D Q     G %   Z L W K   G %  D V  U H I H U H Q F H  W R  I X OORXWSXWSRZHU
7KHVH/(' ¶ V  D O V R  D F W  D V  V L J Q D O  S U H V H Q W  L Q G L F D W R U V 
)URQW,QGLFDW R U V
7KH&OLSOLPLWLQGLFDWRUWHOOVZKHQWKHDPSOLILHU  R X W S X W  L V  F O L S S L Q J  R U  O L P L W L Q J   , W  K DVWZRGLIIHUHQWLQGLFDWLRQVWDWXVHV
%,IWKHFOLSOLPLWHULVHQJDJHGLWKDVDVKRUWWLPHFRQVWDQWDQGLWLOOXPLQDWHVEULHIO\
%,IWKHFOLSOLPLWHULVQRWHQJDJHGLWKDVDQLQFUHDVHGWLPHFRQVWDQWDQGLOOXPLQDWHVIRUDORQJHUSHULRG 
7KHUHPDLQLQJ\HOORZ/('VLQGLFDWHLIDQ\SURWHFWLRQFLUFXLWVDUHDFWLYDWHG7KHVHDUHGHVFULEHGRQSDJH
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
16
9PROTECTION FEATURES
(DFK0DUWLQ$XGLRDPSOLILHUKDVPDQ\DGYDQFHGSURWHFWLRQ I H D W X U H V   S U R W H F W L Q J  E R W K  W K H  D P S O L I L H U  D Q G WKH
ORXGVSHDNHUVFRQQHFWHGWRLWVKRXOGDIDXOWFRQGLWLRQDULVH8QGHUQRUPDOXVHWKHVHIHDWXUHVDUHLQDXGLEOH$OO
SURWHFWLRQFLUFXLWVRSHUDWHLQGH S H Q G H Q W O \ 
9.1Output Limiter
$QRXWSXWOLPLWHULVLQFOXGHGWRDYRLGDPSOLILHUFOLSS L Q J   : K H Q  D Q  D P S O L I L H U  L V  V H Y H U H O \  R Y H U G U L Y H Q   L WVRXWSXWZDYHIRUP
LVFOLSSHGLWVSHDNVDUHVTXDUHGRII±UHGXFLQJWKHFUHVWIDFWRU,QH[WUHPHFDVHVWKHZDYHIRUPFDQDS S U R D F K  W K D W  R I
DVTXDUHZDYH$QDPSOLILHULVQRUPDOO\FDSDEOHRISURGXFLQJIDUPRUHSRZHUXQGHUWKHVHFRQGLWLRQVWKDQLWVQRUPDO
XQGLVWRUWHGUDWHGRXWSXWSRZHU
7KHOLPLWHUZRUNVE\PRQLWRULQJWKH  R X W S X W  D Q G  F R P S D U L Q J  W K H  G L V W R U W L R Q  S U R G X F H G  E H W Z H H Q  W K H  L Q S X W  D Q G  R X W S X W  R I  W K H 
DPSOLILHU,IWKHGLVWRUWLRQH[FHHGV7+'IRUDQ\UHDVRQYROWDJHRUFXUUHQWFOLSSLQJWKHOLPLWHUUHG X F H V  W K H  L Q S X W
VLJQDOSURSRUWLRQDOO\1RWHWKDWLIWKHVLJQDOLVGLVWRUWHGRUFOLSSHGEHIRUHLWUHDFKHVWKHDPSOLILHUWKHFOLSOLPLWHUZLOOQRW
EHDFWLYDWHG
8QGHUQRUPDORSHUDWLRQWKHFOLSOLPLWHULVLQDXGLEOH7KHOLPLWHUFDQEHWXUQHG³ Q´RU³ II´E\SUHVVLQJWKH U H O H Y D Q W  F O L S 
OLPLWVZLWFK6H H  S D J H   
6RPHPDQXIDFWXUHUVRIORXGVSHDNHUSURFHVVRUVGRQRWUHFRPPHQGWKHXVHRIFOLSOLPLWHUVLQDPSOLILHUVDV  L W  FDQ
DIIHFWWKHWUDFNLQJRIWKHSURFHVVRUVOLPLWHUV
,IWKHDPSOLILHU  L V  E H L Q J  X V H G  Z L W K R X W  D Q \  H [ W H U Q D O  O L P L W L Q J   0 D U W L Q  $ X G L R  U H F R P P H Q G  O H D Y L Q J  W K H  FOLSOLPLWHUVVZLWFKHG
 1EX W WRQGHSUHVVHG
9.2Thermal protection
:KHQWKHDPSOLILHULVGULYHQYHU\KDUGLQWRDORZLPSHGDQFHORDGWKHFRROLQJIDQVZLOOUXQDWKLJKVSHHG,IWKHVH
RSHUDWLQJFRQGLWLRQVFRQWLQXHWKH3URWHFWLQGLFDWRUVZLOOLOOXPLQDWHLQGLFDWLQJWKDWWKHDPSOLILHULVDERXW  W R  J R  L Q W R 
WKHUPDOVKX W G R Z Q 
$IWHUILYHVHFRQGVWKHDPSOLILHUZLOOJRLQWRWKHU P D O  S U R W H F W  E \  P X W L Q J  W K H  L Q S X W  V L J Q D O   $ I W H U      VHFRQGVWKH
DPSOLILHUZLOOKDYHFRROHGGRZQ H Q R X J K  I R U  W K H  D P S O L I L H U  W R  F R P H  R X W  R I  V K X W G R Z Q  D Q G  R S H U D W H  D V  Q RUPDO,IWKHORDG
FRQGLWLRQVUHPDLQXQFKDQJHGWKHWKHUPDOSURWHFWLRQZLOOEHUHLQLWLDWHG7KHUPDOSURWHFWLRQRFFXUVZKHQ  W K H  K H DWVLQN
WHPSHUDWXUHUHDFKHV
&
9.3VHF protection
,IDVLJQDORIPRUHWKDQN+]DWIXOOSRZHULVGHWHFWHGIRUPRUHWKDQILYHVHFRQGVWKH9+)SURWHFWLRQ P X W H V  W K H
LQSXWVLJQDO7KLVLVLQGLFDWHGRQWKHIURQWSDQHO4E\WKH/(' O D E H O H G  3 U R W H F W    $ I W H U  I L Y H  V H F R Q G V  W K H  R X W S X W V  Z L O O  X Q 
PXWHDQGUHWXUQWRQRUPDO  R S H U D W L R Q   X Q O H V V  W K H  R X W S X W  V L J Q D O  K D V  U H P D L Q H G  X Q F K D Q J H G   L Q  Z K L F K  F D V H  W K H  9 + )
SURWHFWLRQZLOOUHLQLWLDWH
9.4Short circuit protection
$OO0DUWLQ$XGLR0$6HULHVDPSOLILHUVDUHFRPSOHWHO\VKRUWFLUFXLWSURWHFWHG7KHSURWHFWLRQFLUFXLWSHUPLWVYHU\KLJK
SHDNFXUUHQWVEXWVWLOOKROGVWKHRXWSXWGHYLFHVZLWKLQWKHVDIHRS H U D W L Q J  D U H D   , I  D  V K R U W  F L U F X L W LVPDLQWDLQHGWKH
FKDQQHODIIHFWHGZLOOHYHQWXDOO\JRLQWRDWKHUPDOSURWHFWF\FOHXQWLOWKHVKRUWFLUFXLWKDVEHHQUHPRYHG
9.5AC mains voltage protection
,IWKH$&PDLQVYROWDJHLVRXWVLGHWKHRSHUDWLRQDOZLQGRZRYHURUXQGHUYROWDJH    W K H  S R Z H U  V X S S O \  Z LOODXWRPDWLFDOO\
VKXWGRZQ:KHQWKHPDLQVYROWDJHLVDERYHWKHPLQLPXPVWDUWYROWDJHDQGEHORZLWVPD[LPXPRSHUDWLQJYROWDJHWKH
DPSOLILHUZLOOUHVWDUW
7KHWZRJUHHQµ 1¶/('¶VLQGLFDWHZKHQWKHSRZHUVXSSO\LVRSHUDWLQJFRUUHFWO\
,WWDNHVDFRXSOHRIVHFRQGVWRVHOIFKHFNWKLVLVNQRZQDVWKHVRIWVWDUWRUVORZVWDUWVHTXHQFHWKHJDLQZLOO
VORZO\DQGJUDGXDOO\EHLQFUHDVHGEDFNWRWKHSUHYLRXV O \  V H W  O H Y H O   D Q G  W K H  I D Q V  Z L O O  E O R Z  D W  K L J K  V S H HGEHIRUHJRLQJ
LQWRLGOH 
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
17
9.6DC. protection
7KHUHDU H  W Z R  W \ S H V  R I  ' &  S U R W H F W L R Q 
%)XVHVRQ W K H  V X S S O \  E U D Q F K H V  R I  H D F K  F K D Q Q H O 
%'&FURZED U  S U R W H F W L R Q  W K D W  V K R U W V  W K H  R X W S X W  L I  P R U H  W K D Q    YROWV'&DUHEHLQJGHWHFWHGRQWKHRXWSXWV
%RWKWKHV H  F L U F X L W V  F R P H  L Q W R  H I I H F W  R Q F H  D  ' &  O H Y H O  K D V  E H H Q  G H W H F W H G  R Q  H L W K H U  F K D Q Q H O 
10MAINTENANCE
8QGHUQRUPDOXVHWKHDPSO L I L H U  V K R X O G  S U R Y L G H  \ H D U V  R I  W U R X E O H  I U H H  V H U Y L F H   7 K H  R Q O \  P D L Q W H Q D Q F H UHTXLUHGE\WKH
XVHULVWR F O H D Q  W K H  I U R Q W  J U L O O  S H U L R G L F D O O \ 
,QVRPHH[WUHPHFDVHVLWPD\EHQHFHVVDU\IRUDXWKRUL]HGVHUYLFHSHUVRQQHOWRFOHDQWKHLQVLGHRIWKHDPSOLILHU
7KHVHFRQGLWLRQVXVXDOO\RFFXUDIWHUSURORQJHGXVHHJLQHQYLURQPHQWVXVLQJFUDFNHGRLOVPRNHPDFKLQHV
,I\RXDUHXVLQJ\RXUDPSOLILHUIRUKHDY\GXW\XVHLHFRQFHUWWRXULQJ  R U  L Q G X V W U L D O  P X V L F  L W  L V  U H F R P P H Q G H G  W K D W  \ R X 
KDYH\RXUDPSOLILHUVHUYLFHGHYHU\\HDUVSXUHO\DVDSUHYHQWDWLYHPHDVXUH
10.1Troubleshooting
7KHVHDU H  W \ S L F D O  W K L Q J V  W R  F K H F N  L I  \ R X  W K L Q N  \ R X U  D P S O L I L H U  L V  I D X O W \ 
)DXOW1RRXWSXW
,IWKHVLJQDOSU H V H Q W  / ( '      G %   L V  L O O X P L Q D W L Q J  D  V L J Q D O  L V  H Q W H U L Q J  W K H  D P S O L I L H U   D Q G  W K H  O L N H O \  FDXV H  L V  DQXQVHFXUHG
6SHDNRQFRQQHFWRURUORRVHWHUPLQDWLRQ
&KHFNDOVRWKDWWKH9+)SU R W H F W L R Q  L V  Q R W  D F W L Y D W H G,ILWLVUHPRYHWKHFDXVHRIWKHKLJKIUHTXHQF\RVFLOODWLRQVIURP
WKHUHOHYDQWLQSXW
)DXOW7K H  D P S O L I L H U  J R H V  L Q W R  W K H U P D O  S U R W H F W L R Q  Z K H Q  G U L H Q  D W  O R Z  O H H O 
&KHFNWKDWWKHUHLVQRVKRUWFLUFXLWSUHVHQWDWWKHDPSOLILHUVRXWSXWHJDQ\FRPSRQHQWLQWKHORXGVSHDNHU   W K L V  F D Q
RFFXUZKH Q  W K H  O R X G V S H D N H U  Y R L F H  F R L O  J H W V  K R W  
)DXOW7K H  D P S O L I L H U  J R H V  L Q W R  S U R W H F W L R Q  Z L W K  S R Z H U  L Q G L F D W R U V  R I I 
&KHFNWKDWWKH$&PDLQVYROWDJ H  L V  Z L W K L Q  W K H  D P S O L ILHU¶VRSHUDWLQJUDQJH9DQ G         9 #9
Y H U  X Q G H U  Y R O W D J H  S U R W H F W L R Q  P D \  K D Y H  R F F X U U H G   , I  W K H  D P S O L I L H U  L V  F R Q Q H F W H G  E \  P L V W D N H  W R  D    S K D VHVXSSO\
9DQLQWHUQDOQRQUHVHWDEOHIXVHRUUHVLVWRUPD\KDYHEORZQ7KHDPSOLILHUPXVWWKHQEHUHWXUQHGWR\RXU
VXSSOLHUIRUVHUYLFHUHSDLU
)DXOW7K H  D P S O L I L H U  G R H V  Q R W  U H V S R Q G  H  H Q  D I W H U  F K H F N L Q J  D E R  H  L W H P V 
,QWKHXQOLNHO\HYHQWRIRQDQRQXVHUUHFWLILDEOHIDXOWUHWXUQWKHDPSOLILHUWR\RXUVXSSOLHURUDQ D SSURYHGVHUYLFH
FHQWUH
0DUWLQ$XGLRFDQQRWEHKHOGUHVSRQVLEOHIRUGDPDJHRULQMXU\DV D  U H V X O W  R I  W K H  W R S  F R H U  E H L Q J UHPR H G 
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
18
11WARRANTY
*HQHUDO
7KH0$V3R Z H U  D P S O L I L H U  L V  Z D U U D Q W H G  W R  E H  I U H H  I U R P  G H I H F W V  L Q  F R P S R Q H Q W V  D Q G  I D F W R U \  Z R U N P D Q VKLSXQGHU
QRUPDOXV H  D Q G  V H U Y L F H   I R U  D  S H U L R G  R I  three \ H D U V  I URPWKHGDWHRIRULJLQDOSXUFKD V H   ' X U L Q J  W K L V  Z D U U D Q W \  S H U L R G
0$57,1$8',  / 7 '  R U  L W  V  Q R P L Q D W H G  D J H Q W V   Z L O O  X Q G H U W D N H  W R  U H S D L U   R U  D W  L W  V  G L V F U H W L R Q   U H S O D F H  W K LVSURGXFWDWQR
FKDUJHWRLWVRZQHUZKHQIDLOLQJWRSHUIRUPDVVSHFLILHGSURYLGLQJWKHXQLWLVUHWXUQHGXQGDPDJHGLQLWVRULJLQDO
SDFNDJLQJVKL S S L Q J  S U H S D L G   W R  W K H  I D F W R U \   G L V W U L E X W R U  R U  D X W K R U L V H G  V H U Y L F H  I D F L O L W \ 
7KLVZDUUDQ W \  V K D O O  E H  Q X O O  D Q G  Y R L G   L I  W K H  S U R G X F W  L V  V X E M H F W H G  W R 
 5HSDLUZRUNRUDOWHUDWLRQ  E \  S H U V R Q V  R W K H U  W K D Q  W K R V H  D X W K R U L V H G  E \  0 $ 5 7 , 1  $ 8 ' ,  / 7 '
RULWVDJHQWV
 6KLSSLQJDFFLGHQWVDFWRIJRGZDUFLYLOLQVXUUHFWLRQPLVXVHDEXVHRSHUDWLRQZLWKLQFRUUHFW$&YROWDJH
RSHUDWLRQZLWKIDXOW\DVVRFLDWHGHTXLSPHQWH[SRVXUHWRLQFOHPHQWZHDWKHUFRQGLWLRQVDQGQRUPDOZHDUDQG
WHDU8Q L WVRQ ZKLFKWKHVHULDOQXPEHUKDVEHHQUHPRYHGRUGHIDFHGZLOOQRWEHHOLJLEOHIRUZDUUDQW\VHUYLFH
 0$57,1$8', /7'VKDOOQRWEHUHVSRQVLEOHIRUDQ\LQFLGHQWDORUFRQVHTXHQWLDOGDPDJHVZLWKUHVSHF W  WR
WKHSURGXFWVZDUUDQWHG
0$57,1$8', /7'UHVHUYHWKHULJKWWRPDNHFKDQJHVRULPSURYHPHQWVLQGHVLJQRUPDQXIDFWXULQJZLWKRXW
DVVXPLQJDQ\REOLJDWLRQWRFKDQJH  R U  L P S U R Y H  S U R G X F W V  S UHYLRXVO\PDQXIDFWXUHG
7KLVZDUUDQW\LVH[FOXVLYHDQGQRRWKHUZDUUDQW\LVH[SUHVVHGRULPSOLHG
7KLVZDUUDQW\GRHVQRWDIIHF W  \ R X U  VWDWXWRU\ULJKWV
,QWHUQDWLRQDO
3OHDVHFRQWDFW\RXUVXSSOLHUIRUWKLVLQIRUPDWLRQDVULJKWVDQGGLVFODLPHUVPD\YDU\IURPFRXQWU\WRFRXQWU\
7HFKQLFDODVVLVWDQFH D Q G  V H U L F H V
,QWHUQDWLRQDO
,I\RXU0DUWLQ$XGLRSURGXFWQHHGVUHSDLUFRQWDFW\RXU0DUWLQ$XGLRGHDOHURUGLVWULEXWRURUFRQWDFWPDUWLQ$XGLRE\
ID[RUHPDLOWRREWDLQWKH  O R F D W L R Q  R I  W K H  Q H D U H V W  G H D O H U  R U  G L V W U L E X W R U 
7HOHSKRQH                
)D[
(PDLOLQIR#PDUWLQ D X G L R  F R P 
ZZZPDUWLQDXG L R  F R P 
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
19
12SPECIFICATIONS MA2.8S
0$;,08028738732 : ( 5
0/6LQG%SRVLWLRQ
(,$#N+]WKG )7&±N+]#WKG
1SHU&KDQQHO : :
1SHU&KDQQHO : :
1SHU&KDQQHO : :
1%ULGJHG : :
1%ULGJHG : :
0$;,08028738792/7$*(
1ORDG   9 U P V
3HDNYROWDJHQRORDG  9UPV
32:(55(4 8 , 5 ( 0 ( 1 7 6    9  H U V L R Q     9  H U V L R Q 
S H U D W L Q J  Y R O W D J H      ±      9 D F    ±     9 D F
0LQLPXPVWDUWXSYROWDJ H  9DF 9DF
3HDNLQUXVKFXUUHQW $ $
0$,16&855(17'5$:#2KPV V HUVLRQ 9 HUVLRQ
4XLHVFHQWFXUUHQWQRORDG $UPV     $ U P V

WK)XOOSRZHUERWKFKDQQHO V  G U L Y HQ $UPV $UPV

UG)XOOSRZ H U   E R W K  F K D Q Q H O V  G U LYHQ $UPV $UPV
)XOOSRZH U    . K ]  #    W K G       $ U P V      $ U P V
',67257,21
7+'+]±.+]:WRIXOOSRZHU 
7+'#.+]G%EHORZ F O L S       
',0#G%EHO R Z  FOLS 
+8012,6( G%
&+$11(/6(3(5$7,21 G%
287387,03('$1 & ( P1
6/(:5$7( 9+6
,13876
',3VZLWFKVHOHFWDEOHJDLQ5HI
1IRUIXOOSRZ H U  0 / 6    G % 
,PSHGDQFH .1'LIIHUHQWLDO
.16LQJOHHQGHG
FPUU G%
',0(16,216 :PP[+PP['PP   L Q F O   + D Q G O H V 
:LQV[+LQV['LQVLQFO+DQGOHV
*DLQG%             
,QSXWG%X        
,QSXW9UPV        
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES

Martin Audio – MA2.8s (ETL) Amplifier
ENGLISH
20
:(,*+7 .J,EV
6+,33,1*',0(16,216 :PP[+PP['P P
:LQV[+LQV['LQV
6+,33,1*:(,*+ 7   .JOEV
)URQW3DQHO
*DLQFRQW U R O V   [     3 R V L W L R Q  G H W H Q W
,QGLFDWRUV3U R W H F W   [  < H O O R Z  / ( ' ¶ V
,QGLFDWRUV&OLS  [  5 H G  / ( ' ¶ V
,QGLFDWRUV6L J Q D O  3 U H V H Q W   [  * U H H Q  / ( ' ¶ V
5HDU3DQHO
,QSXW&RQQHFWRUV [1HXWULN&RPERSLQ3KRHQL[
X WSXW&RQQHFWRUV [1HXWULN6SHDNRQV
&OLS/LPLWHUV 3XVK6ZLWFK³ 1´´ ))´SHU&KDQQHO
0/66ZLWFKHV G%G%G%G%
6SHDNRQ¸DQG&RPE ºMDFNDUHUHJLVWHUHG  7 U D G H P D U N V  R I  1 H X W ULN$*/LHFKWHQVWHLQ
0/6¸DUH UHJ LVWHU HG7UDGHPDUNVRI/DE*UXSSHQ$%.XQJVEDFND6ZHGHQ
All material © 2007. Martin Audio Ltd. Subject to change without notice.
CONTENTS
<
>
PRINT
GUIDES