MC2 Audio E4-75 User manual

E4
E4E4
E4-
--
-75
7575
75
OWNER’S
MANUAL
MC
2
AUDIO Ltd.,
Units 6-8, Kingsgate,
Heathpark Industrial state,
HONITON,
Devon X14 1YG
ngland
Tel: +(0)1404.44633 Fax: +(0)1404.44660
www.mc2-audio.co.uk

2
CONTENTS
EC DECLARATION OF CONFORMITY 3
IMPORTANT SAFETY INSTRUCTIONS 4, 6, 7
INSTALLATION Electrical 4
RF Emissi ns 5
Mechanical 5
GENERAL INFORMATION 8
CONNECTIONS Inputs 8
Outputs 9
Bridged Operati n 9
OPERATION Switching n 11
Level c ntr ls 11
Limiters 11
Signal level indicat rs 11
PRC indicat rs 11
Temperature c ntr l 11
Fault indicat r 12
MAINTENANCE 12
TECHNICAL SPECIFICATION 13
NOTE THAT ALL AMPLIFIERS* BEFORE SERIAL NUMBER 7E70004 HAVE A DIFFERENT
WIRING CONFIGURATION FOR THE INPUT AND OUTPUT SOCKETS. THIS WILL ONLY
AFFECT THE ‘LINKED’ OR ‘BRIDGED’ MODES OF OPERATION.
* Serial numbering f r the E4-75 c mmenced with 6E7.....

3

4
IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructi ns.
2) Keep these instructi ns.
3) Heed all warnings.
4) F ll w all instructi ns.
5) D n t bl ck any ventilati n penings and install in acc rdance with the manufacturer’s
instructi ns.
6) Unplug this apparatus during lightning st rms r when unused f r l ng peri ds f time.
7) Clean nly with a dry cl th.
8) D n t use this apparatus near water; the apparatus shall n t be exp sed t dripping r
splashing and n bjects filled with liquids, such as vases shall be placed n the
apparatus.
9) Refer all servicing t qualified service pers nnel. Servicing is required when the apparatus
has been damaged in any way, such as if the p wer-supply c rd r plug is damaged,
liquid has been spilled r bjects have fallen int the apparatus, the apparatus has been
exp sed t rain r m isture, d es n t perate n rmally, r has been dr pped.
INSTALLATION INSTRUCTIONS - ELECTRICAL
This amplifier has been manufactured t c mply with y ur l cal p wer supply requirements but,
bef re c nnecting the unit t the supply, ensure that the v ltage (printed n the rear panel) is
c rrect.
Make sure p wer utlets c nf rm t the p wer requirements listed n the back f the unit.
Damage caused by c nnecting t impr per AC v ltage is n t c vered by the warranty.
SAFETY WARNING
Where a MAINS plug r appliance c upler is used as the disc nnect device, it sh uld remain
readily perable.
Where the amplifier is m unted in a rack and permanently c nnected t the mains, then the rack
sh uld be installed with a readily accessible c nnect r r an ALL POLE circuit breaker.
This unit is fitted with a 3-wire p wer c rd. F r safety reas ns THE EARTH LEAD SHOULD NOT
BE DISCONNECTED IN ANY CIRCUMSTANCE. If gr und l ps are enc untered, c nsult the
secti n n ‘Input C nnecti ns’ later in this manual.
THE WIRING COLOURS ARE:
230V AREAS: EARTH = GREEN AND YELLOW 120V AREAS: EARTH = GREEN
NEUTRAL = BLUE NEUTRAL = WHITE
LIVE = BROWN LIVE = BLACK
WARNING T reduce the risk f fire r electric sh ck, d n t exp se this apparatus t rain r
m isture.
TO AVOID ELECTRICAL SHOCK DO NOT REMOVE COVERS. REFER ALL SERVICING TO
UALIFIED PERSONNEL.

5
DO NOT USE THE UNIT IF THE ELECTRICAL POWER CORD IS FRAYED OR BROKEN. The
p wer supply c rds sh uld be r uted s that they are n t likely t be walked n r pinched by
items placed up n r against them, paying particular attenti n t c rds and plugs and the p int
where they exit fr m the appliance.
ALWAYS OPERATE THE UNIT WITH THE AC GROUND WIRE CONNECTED TO THE
ELECTRICAL SYSTEM GROUND. Precauti ns sh uld be taken s that the means f gr unding
f a piece f equipment is n t defeated.
DO NOT REMOVE THE LID. Rem ving the lid will exp se y u t p tentially danger us v ltages.
There are n user serviceable parts inside.
INSTALLATION EMC (RF Emissions)
The high frequency res nant c nverters in the E Series amplifiers have been designed t have
very l w radi frequency (RF) emissi ns, which can cause interference with ther equipment. In
rder t reduce the influence f this, P wer Amplifiers sh uld be m unted in a dedicated metal
rack encl sure, which d es n t include equipment which may be sensitive t RF radiati n, such as
radi micr ph ne receivers.
INSTALLATION MECHANICAL
T ensure that this equipment perf rms t specificati n, it sh uld be m unted in a suitable rack r
encl sure as described bel w. Like all high p wer amplifiers, it sh uld be kept away fr m ther
equipment which is sensitive t magnetic fields r RF radiati n. Als , this amplifier may suffer a
substantial reducti n in perf rmance if it is subjected t , r m unted cl se t , equipment which
radiates high RF fields, such as p wer transmitters.
When m unting the amplifier in a rack r encl sure, ensure that:-
1. the rear f the unit is adequately supp rted. The brackets which are supplied fit standard 19
inch (483mm) rack m unting systems. THE FRONT PANEL IS NOT CAPABLE OF
SUPPORTING THE UNIT ON ITS OWN;
2. THERE IS ADEQUATE VENTILATION. The c ling fans suck c l air in thr ugh the fr nt and
bl w h t air ut at the rear f the unit thr ugh the ventilating grills. IF THIS AIR IS NOT
ALLOWED TO ESCAPE, OVER-HEATING WILL OCCUR. Take care when m unting ther
equipment in the same rack;
3. the rack unit has a separate earth c nnecti n (technical earth).
ALSO SEE MAINTENANCE SECTION, page 9.

6
1.
Read these instructi ns.
2. Keep these instructi ns.
3. Heed all warnings.
4. F ll w all instructi ns.
5. D n t use this apparatus near water.
6. Clean nly with a dry cl th.
7. D n t bl ck any ventilati n penings, install in
acc rdance with the manufacturer’s instructi ns.
8. D n t install near any heat s urces, such as radiat rs,
heat registers, st ves r ther apparatus (including
amplifiers) that pr duce heat.
9. Pr tect the p wer c rd fr m being walked n r
pinched particularly at plugs, c nvenience receptacles
and the pint where they exit fr m the apparatus.
10. The mains circuit breaker shall remain readily
accessible.
11. Only use attachments/access ries specified by the
manufacturer.
12. Use nly with the cart, trip d, bracket r table
specified by the manufacturer, r s ld with the
apparatus. When a cart is used, use cauti n when
m ving the cart/apparatus c mbinati n t av id injury
fr m a tip ver.
13. Disc nnect this apparatus during lightning st rms r
when unused f r a l ng peri d f time.
14.
Refer all servicing t qualified service pers nnel.
Servicing is required when the apparatus has been
damaged in any way, such as if the p wer-supply c rd
r plug is damaged, liquid has been spilled r bjects
have fallen int the apparatus, the apparatus has been
exp sed t rain r m isture, d es n t perate
n rmally, r has been dr pped.
15. D n t exp se this equipment t dripping r splashing
and ensure that n bjects filled with liquids, such as
vases, are placed n the equipment.
16. T c mpletely disc nnect this equipment fr m the AC
mains, disc nnect the p wer c rd fr m the mains
circuit breaker.
17. Where the amplifier is m unted in a rack and
permanently c nnected t the mains, then the rack
sh uld be installed with a readily accessible c nnect r
r an ALL POLE circuit breaker with 3mm breaking
distances.
18. This unit is fitted with a 3-wire p wer c rd. F r safety
reas ns, THE EARTH LEAD SHOULD NOT BE
DISCONNECTED IN ANY CIRCUMSTANCE.
19. The c ling fans suck c l air in thr ugh the fr nt and
bl w h t air ut at the rear f the unit thr ugh the
ventilating grills. The fr nt and rear f the amplifier
sh uld have free exp sure t the air (i.e. in a rack
leave the fr nt and rear d rs ff), with 2cm air gap at
the sides and t p. IF AIR IS NOT ALLOWED TO
ESCAPE FROM THE REAR, OVER-HEATING WILL
OCCUR. Take care when m unting ther equipment in
the same rack.
20. The mains switch n the amplifiers nly switches ne
p le f the mains supply, theref re f r units with a
detachable c rd t be fully disc nnected fr m the
mains, the mains disc nnect device (ie mains plug r
mains c upler) sh uld remain readily perable. F r
units with a fixed mains lead the external all p le
circuit breaker with 3mm breaking distances is the
disc nnect device and theref re the installati n f the
amplifier shall be carried ut in acc rdance with all the
applicable installati n rules.
WARNING:
Apparatus with CLASS I c nstructi n s
hall be c nnected t a MAINS s cket utlet with a pr tective
earthing c nnecti n.
WARNING: T prevent injury, this apparatus must be securely attached t the rack in acc rdance with the installati n
instructi ns.

7
1. Lisez ces instructi ns.
2. Gardez ces instructi ns.
3. Faites attenti n à t us les avertissements.
4. Suivez t utes les instructi ns.
5. N'utilisez pas cet appareil près de l'eau.
6. Faites le ménage seulement avec un tissu sec.
7. Ne bl quez pas d' uvertures de ventilati n, installez
c nf rmément aux instructi ns du fabricant.
8. N'installez près d'aucunes s urces de chaleur, c mme les
radiateurs, les registres de chaleur, les cuisinières u
d'autre appareil (en incluant des amplificateurs) qui
pr duisent la chaleur.
9. Pr tégez la c rde de p uv ir d'être marché sur u pincé
particulièrement aux prises de c urant, les réceptacles
d'avantage et la pinte ù ils s rtent de l'appareil.
10. Le disj ncteur de c nduite principale restera sans hésiter
accessible.
11. Utilisez seulement des attachements/access ires spécifiés
par le fabricant.
12. Utilisez seulement avec le chari t, le trépied, la parenthèse
u la table spécifiée par le fabricant, u vendu avec
l'appareil. Quand un chari t est utilisé, utilisez la prudence
en déplaçant la c mbinais n de chari t/appareil p ur éviter
la blessure d'un b ut.
13. Débranchez cet appareil pendant les tempêtes de f udre
u quand neuf pendant un l ng terme de temps.
14. Renv yez t ut l'entretien au pers nnel de service qualifié.
L'entretien est exigé quand l'appareil a été nui de t ute
faç n, c mme si la c rde de p uv ir pr visi n u la prise
de c urant s nt nuis, le liquide a été déversé u les bjets
s nt t mbés dans l'appareil, l'appareil a été exp sé p ur
pleuv ir u l'humidité, n' père pas n rmalement, u a été
baissé.
15. N'exp sez pas cet équipement au fait de t mber g utte à
g utte u au fait d'éclab usser et garantissez qu'aucun
bjet rempli des liquides, c mme les vases, n'est placé sur
l'équipement.
16. P ur c mplètement débrancher cet équipement de la
c nduite principale de c urant alternatif, débranchez la
c rde de p uv ir du disj ncteur de c nduite principale.
17. Où l'amplificateur est m nté dans un ég utt ir et en
permanence racc rdé à la c nduite principale, al rs
l'ég utt ir devrait être installé avec un c nnecteur sans
hésiter accessible u TOUT le disj ncteur de PÔLE avec 3
millimètres cassant des distances.
18. Cette unité est c rresp ndue avec une c rde de p uv ir de
3 fils. P ur les rais ns de sécurité, l'AVANCE DE TERRE NE
DEVRAIT ÊTRE DÉBRANCHÉE DANS AUCUNE
CIRCONSTANCE.
19. Les ventilateurs engl utissent l'air frais par le fr nt et
s ufflent l'air chaud à l'arrière de l'unité par les grils
aérants. Le fr nt et l'arrière de l'amplificateur devraient
av ir l'exp siti n libre à l'air (c'est-à-dire dans un ég utt ir
mettent les p rtes de devant et arrière), avec le tr u
aérien de 2 centimètres aux côtés et au haut. Si n NE
PERMET PAS QUE D'AIR S'ÉCHAPPE DE L'ARRIÈRE, LE
FAIT DE SURCHAUFFER SE PRODUIRA. Faites attenti n en
m ntant d'autre équipement dans le même ég utt ir.
20. L'interrupteur principal sur les amplificateurs ne c upe
qu'un pôle de l'alimentati n secteur. le c rd n IEC
permettra de déc nnecter l'appareil de l'alimentati n
secteur, p ur cette rais n l'accès à ces fiches (fiche mâle
u femelle) d it être facilités.
P ur les appareils avec un câble d'alimentati n fixe sans
fiche secteur, le disp sitif de c upure mnip laire ayant
une distance d' uverture de c ntact d'au m ins 3mm, sera
le disp sitif permettant la déc nnexi n c mplète de
l'appareil.
P ur cette rais n l'installati n et le racc rdement de
l'amplificateur devra ce faire c nf rmément au
réglementati n en vigueur.
ATTENTION
: Appareils de c nstructi n de CLASSE I d it être racc
rdé au réseau électrique via une prise de c urant reliée à la
terre.
ATTENTION: P ur éviter t ute blessure, cet appareil d it être s lidement fixé à la t rture, c nf rmément aux instructi ns
d'installati n.

8
GENERAL INFORMATION
Y ur E4-75 p wer amplifier utilises pr prietary designed l ad impedance sensing utput
circuitry, which enables the amplifier t drive the high v ltage swings ass ciated with speaker
impedances f 8 hms and ab ve, but aut matically switches t a high current/medium v ltage
utput required by 4 hm l ads.
Fan speed is varied as required t keep the amplifier within its temperature limits. Signal limiters
are included t pr tect speakers fr m clipped signals.
The amplifier includes full DC and sh rt circuit pr tecti n t ensure tr uble-free service even in
‘harsher’ envir nments.
The E SERIES intr duces three user-c ntr lled features previ usly n t seen n MC
2
Audi
amplifiers:
 Bar LED level indicat rs n the fr nt panel.
 P wer reducti n c ntr l (PRC)
 User-settable gain/sensitivity (internal)
Power Reduction Circuit (PRC) and Impedance Sensing
There are tw PRC circuits in the E4-75: ne f r channels A & B and ne f r channels B & C.
When the amplifier is t be used with 4 hm speakers ( r bridged m n int 8 hms) r if y u
want t reduce the maximum p wer t pr tect the speakers, then the PRC can be selected via the
switches n the rear panel.
Whenever an audi signal f medium amplitude is present n any channel and, if the speaker
impedance n any f the channels is less than 5.5 hms, then the Automatic Impedance
Sensing circuit will set that pair f channels t the 4 hm p siti n.
CONNECTIONS
NOTE THAT ALL AMPLIFIERS BEFORE SERIAL NUMBER 7E70004 HAVE A DIFFERENT
WIRING CONFIGURATION FOR THE INPUT AND OUTPUT SOCKETS. THIS WILL ONLY
AFFECT THE ‘LINKED’ OR ‘BRIDGED’ MODES OF OPERATION.
INPUTS
The inputs are made via 3-pin XLR c nnect rs, which are electr nically balanced and sh uld be
c nnected via a high grade twin c re screened cable, as f ll ws:-
Pin 1 - Screen (see n te) Pin 2 - +ve signal (h t) Pin 3 - -ve signal (c ld)
Note: +ve and –ve den tes the phase f the signal

9
The amplifier is designed t perate with fully balanced equipment and gr und l ps r l ss f
perf rmance may be experienced if c nnected t unbalanced s urces. If it is unav idable h wever,
the f ll wing wiring sh uld be used. The cable sh uld still be twin c re plus screen.
Pin 1 - Screen - c nnected t the chassis f the unbalanced equipment - r left disc nnected at
the unbalanced end.
Pin 2 - +ve signal
Pin 3 - -ve signal
Note: This amplifier is wired t the latest industry rec mmendati ns. PIN1 is c nnected directly
t the chassis/mains earth. If gr und l ps (mains hum) are enc untered rem ve the
screen c nnecti n fr m the ther end f the cable and leave it pen circuit. If pr blems
persist, c nsult y ur dealer/supplier. DO NOT TAMPER WITH OR ALTER ANY
GROUND (EARTH) CONNECTIONS INSIDE THE AMPLIFIER.
F r BRIDGED OPERATION use channels A & B ( r C & D). Inputs sh uld be c nnected t channel
A ( r C). Pressing the A/B link switch ( r C/D link switch) n the rear panel c nnects B amplifier t
the A input ( r the D amplifier t the C input).
Input Link Switches.
The three input link switches n the rear panel link the inputs f the channels t the ne higher up
the hierarchy ladder. S the f ll wing c mbinati ns can be achieved.
A & B (input n A) B & C (input n B) C & D (input n C)
A & B & C (input n A) B & C & D (input n B)
A & B & C & D (input n A)
This switching, t gether with internal cr ss ver cards ( pti nal extras) pr vides a wide variety f
input c nnecti n pti ns.
OUTPUTS
The speaker utputs are via Neutrik Speak n c nnect rs: 2-p le (NL2FC) r 4-p le (NL4FC)
c nnect rs can be used. Terminati ns (all c nnect rs) are as f ll ws:-
Pin +1 = +ve signal utput
Pin -1 = -ve signal utput
F r ease f installing bi-amped r bridged speakers, utput c nnect r A als carries utput B and
utput c nnect r C als carries utput D. The terminati ns are as f ll ws:
Output c nnect r A Pin +1 = +ve channel A Pin -1 = -ve channel A
Pin +2 = +ve channel B Pin -2 = -ve channel B
Output c nnect r C Pin +1 = +ve channel C Pin -1 = -ve channel C
Pin +2 = +ve channel D Pin -2 = -ve channel D
F r bi-amped operation c nnect as ab ve.
F r bridged operation c nnect as f ll ws:
Channels A & B +ve = channel B +ve (pin +1 n c nnect r B r +2 n c nnect r A)
-ve = channel A –ve (pin -1 n c nnect r A)

10
Channels C & D +ve = channel D +ve (pin +1 n c nnect r D r +2 n c nnect r C)
-ve = channel C –ve (pin -1 n c nnect r C)
Note: B th level c ntr ls must be set t the same p siti n.
When operating in bridged mode, the minimum impedances are 8 ohms.
Note: 1. Negative (-ve) utput terminals must n t be j ined t gether, since they are n t b th at
0V.
2. Because the currents inv lved are very high, the speaker cables sh uld c nf rm t the
f ll wing minimum requirements, therwise the l sses will cause the cables t get h t
and audi p wer will be reduced:
E4-75 - 14A int 4 hm speaker l ads.
3. D n t c nnect the inputs/ utputs t any ther v ltage s urce such as a battery,
mains s urce r p wer supply, regardless f whether the amplifier is turned n r ff.
3. D n t run the utput f any amplifier channel back int an ther channel’s input and
d n t parallel r series-c nnect an amplifier utput with any ther amplifier utput.

11
Operation
SWITCHING ON
At ‘switch- n’ the pr tecti n circuit will initially activate whilst the circuits stabilise. Assuming n
faults are detected after a few sec nds, the red A/P LED will g ff.
PANEL CONTROLS AND INDICATORS
Level c ntr ls
These are anal gue c ntr ls all wing precise level settings. N te that in ‘BRIDGED’ m de, b th
level c ntr ls must be set t the same p siti n.
Limiters
Each channel inc rp rates a high perf rmance limiting circuit that prevents the utputs fr m
‘clipping’ when the maximum level is exceeded. They have been designed t be transparent t
signals bel w this level and the attack and release times have been ptimised f r them t be
un btrusive when in perati n.
Level Indicat rs
Each channel has an LED level ‘bar’, which sh ws green up t the -3dB p int, then range and
finally a red limit LED. N te the limit LED has a different resp nse time t the thers and with fast
transients, can be ‘ n’ even th ugh s me f the l wer level LEDs are n t.
PRC Indicat rs (green LED)
These indicate when the PRC circuit, f r the specific pair f channels, has been selected. (Either
manually via the switches n the rear panel r aut matically via the impedance sensing circuit)
Temperature C ntr l
The c ling fans resp nd t temperature sens rs within the unit t maintain a safe perating
temperature. In the event f excessive temperature, the pr tecti n circuit will perate, disabling
the utput. The red ‘AUDIO-PROTECT’ (A/P) LED will indicate this c nditi n. (See fault indicat r).
There are 4 fans c nnected permanently with variable speed and a jumper link t enable them
fr m c ld.
Normal dynamic signals will not cause the amplifier to overheat unless the ventilation
is inadequate. (See installation section and maintenance section.)

12
Fault Indicat r (Audi Pr tecti n – red LED)
If the utputs are sh rted r if DC is present, the pr tecti n circuit will disengage the utputs and
the A/P LED will illuminate. The amplifier will c ntinue t be m nit red and depending n the type
f fault, will either reset after the fault has cleared r require manual resetting by switching ff at
the mains switch and then n again after a few sec nds. (See als temperature c ntr l ab ve.)
Maintenance
CAUTION: These servicing instructions are for use by qualified personnel only. Ensure
that electrical power to the unit is disconnected before carrying out any maintenance.
GAIN/SENSITIVITY SETTINGS
Gain settings are changed internally by simple jumper links. F ur r ws f pins marked:- GAIN A,
GAIN B, GAIN C and GAIN D - are situated n the input PCB (PCB721). A jumper link sets the gain
and the settings are as f ll ws:
Link 1 & 2 gives 32dB gain
Link 3 & 4 gives 26dB gain
Link 4 & 5 gives appr x. 31dB gain = 6dBu/1.5V sensitivity int 4 hms
NOTE: Fact ry setting is n rmally link 1 & 2 = 32dB gain.
Setting higher gain d es n t change the maximum available p wer but changes the level
f signal input t achieve maximum p wer. In any case, pr vided that the input signal is
less than 20dBu/7.7V, the built in limiter circuit will prevent dist rti n within the amplifier.
The gain sh uld be set t match the signal fr m the s urce, e.g. mixer, c ntr ller,
equaliser etc.
AIR FILTER
The filter behind the air intake apertures n the fr nt f the E4-75 amplifier sh uld be cleaned
r replaced peri dically, e.g. 3-6 m nths. (Filters in amplifiers l cated in m re 'dirty' atm spheres
may require m re frequent maintenance.) Access is via the blue fr nt panel. The filter sh uld be
'dry' cleaned, using a vacuum cleaner preferably. Running the unit with ut a filter is n t
rec mmended unless it is within a 'clean r m'. Replacement filter material is available.
N ther regular maintenance is required.
If you have any doubt about carrying out this procedure, refer to a service engineer or
contact your dealer.
IF YOUR AMPLIFIER DEVELOPS A FAULT, PLEASE REFER TO YOUR SUPPLIER FOR
SERVICE AND TECHNICAL SUPPORT.
DO NOT ATTEMPT TO REPAIR THE FAULT YOURSELF AS THIS WILL INVALIDATE THE
WARRANTY.

13
TECHNICAL SPECIFICATION
Main Specifications - E series Amplifiers
Parameter (Units) E90 E45 E25 E15 E100 E475
Output Power (per channel) (Watts)
8 ohms 2500 1250 700 450 1400 775
4 ohms 4800 2500 1350 850 2800 900
2 ohms 8200 4200 2400 1550 3700 NA
Output Power (bridged) ( Watts)
8 ohms 9600 5000 2700 1700 5300 1800
4 ohms 16400 8400 4800 3100 7400 NA
THD+N:(%)(4 ohms)
@1kHz (@1dB below max output power) < 0.15 0.015 0.008 0.008 0.08 0.008
@20Hz to 20kHz (@3dB below max output power) < 0.5 0.05 0.03 0.03 0.15 0.03
Gain Options (dB)
32/36/39 26/32/36 26/32/33 26/31/32 26/32/36 26/31/32
Sensitivity Options
(for maximum power)
(dBu)
13/9/6 15.7/9.7/5.7 13/7/6 11/6/5 16/10/6 11/6/5
Sensitivity Options
(for maximum power)
(Volts)
3.5/2.2/1.5 4.7/2.4/1.5 3.5/1.7/1.5 2.7/1.5/1.4 4.9/2.5/1.5 2.7/1.5/1.4
Frequency Response - 20Hz to 20kHz (dB)
±1.0 +0 / -0.3 +0 / -0.3 +0 / -0.3 ±0.5 +0 / -0.3
Power Consumption:
Nominal @ 240v (4 ohms)
(Amps)
5.6 4.5 3 2.1 7 2.7
Power Consumption:
Nominal @ 120v (4 ohms)
(Amps)
11.2 9 6 4.2 14 5.4
Dimensions: (mm)
Amplifier: H x W x D 88 x 482 x 428
Boxed (shipping UK): H x W x D 230 x 580 x 560
Boxed (shipping - all except UK): H x W x D 250 x 610 x 600
Weight: (Kgs)
Amplifier: 11.78 11.42 10.16 9.8 12 10.62
Boxed:(shipping) 13.78 13.42 11.92 11.66 14 12.62
Additional Specifications
Input Impedance - Active balanced (k ohms) 20 20 20 20 20 20
Input CMRR (dB)
>60 >60 >60 >60 >60 >60
Hum & Noise (dB below max output) -105 -106 -105 -105 -105 -105
Damping Factor:
@1kHz into 8 ohms >400 >400 >400 >400 >400 >400
Signal Limiters -
(set to prevent excessive clipping) Yes Yes Yes Yes Yes Yes
Protection: Short circuit / DC output / Temperature
Yes Yes Yes Yes Yes Yes
Mains in-rush control. Yes Yes Yes Yes Yes Yes
Output Power (watts) into 8 ohms
Sine wave @ 1kHz 2400 1100 650 400 1150 725
Continuous music with Crest Factor of 2.8 (9dB) 2400 1200 675 425 1300 750
Continuous music with Crest Factor of 4.8 (14dB) 2500 1250 700 450 1400 775
Continuous music with Crest Factor of 7.8 (18dB) 2600 1350 725 475 1480 825
Output Power (watts) into 4 ohms
Sine wave @ 1kHz 4500 2050 1200 775 2250 750
Continuous music with Crest Factor of 2.8 (9dB) 4400 2400 1250 825 2600 825
Continuous music with Crest Factor of 4.8 (14dB) 4800 2500 1350 850 2800 900
Continuous music with Crest Factor of 7.8 (18dB) 5000 2700 1350 875 2900 900
Output Power (watts) into 2 ohms
Sine wave @ 1kHz 7200 3300 2200 1350 3200 NA
Continuous music with Crest Factor of 2.8 (9dB) 6800 4100 2300 1500 3600 NA
Continuous music with Crest Factor of 4.8 (14dB) 8200 4200 2400 1550 3700 NA
Continuous music with Crest Factor of 7.8 (18dB) 8900 4300 2600 1600 3700 NA
An internal link can be set t either 100V r 120V f r the 115V versi n and 220V r 240V f r the
230V versi n. N rmally these are set t 120V and 240V respectively.
This amplifier will only operate to its very high specification if it is installed and
operated as described in this manual.

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