AT M2000 User manual

OPERATION MANUAL
This manual doesnot include allof the detailsof design, production,or variations ofthe equipment. Nordoes it coverevery possible
situation which mayarise during installation,operation or maintenance.
The information providedin this manualwas deemed accurateas of thepublication date. However, updates tothis information may
have occurred.To obtainthe latest versionof this manual,please visit theAT website at www.atprofessional.com.au.
M2000
dB
0
8
-
dB
0
8
-
I
O
PROTECT
CLIP
SIGNAL
ACTIVE
PROTECT
CLIP
SIGNAL
ACTIVE
POWERCH A CH B
M2000

M SeriesPower Amplifiers
page 2 Operation Manual
1) Read theseinstructions.
2) Keep these instructions.
3) Heed allwarnings.
4) Follow allinstructions.
5) Do notuse this apparatusnear water.
6) Clean onlywith a drycloth.
7) Do notblock any ventilationopenings. Install
in accordance withthe manufacturer s instr-
uctions.
8) Do notinstall near anyheat sources suchas
radiators, heat registers,stoves, or other
apparatus that produceheat.
9) Do notdefeat the safetypurpose of thepolari-
zed or grounding-typeplug. A polarizedplug
has two bladeswith one widerthan the other.
A grounding-type plughas two bladesand a
third grounding prong.The wide bladeor the
third prong isprovided for yoursafety.If the
provided plug doesnot fit intoyour outlet,
consult an electricianfor replacement ofthe
obsolete outlet.
10) Protect thepower cord frombeing walked on
or pinched, particularlyat plugs, convenience
receptacles, and thepoint where theyexit from
the apparatus.
11) Only useattachments/accessories specified
by the manufacturer.
12) Use onlywith a cart,stand, bracket, ortable
specified by themanufacturer,or sold withthe
apparatus. When acart is used,use caution
when moving thecart/apparatus combination
to avoid injuryfrom tip-over.
13) Unplug thisapparatus during lightningstorms
or when unusedfor long periodsof time.
14) Refer allservicing to qualified service perso-
nnel.Servicing is required whenthe apparatus
has been damagedin any way, such aspower-
supply cord orplug is damaged,liquid has
been spilled orobjects have falleninto the
apparatus, the apparatushas been exposedto
rain or moisture,does not operatenormally,
or has beendropped.
15) Toreduce the riskof fire orelectric shock, do
not expose thisapparatus to rainor moisture.
TO PREVENT ELECTRIC SHOCK DO NOT REM-
OVE TOP OR BOTTOM COVERS. NO USERSE-
RVICEABLE PARTSINSIDE. REFER SERVICING
TO QUALIFIED SERVICE PERSONNEL.
MAGNETIC FIELD
CAUTION! Do notlocate sensitive highgainequipment such as
preamplifiers or tapedecks dirctly aboveor below theunit. Be-
cause this amplifierhas a highpower density, it hasa strong
magnetic field whichcan induce huminto unshielded devices
that are locatednearby.The field isstrongest just aboveandb-
elow the unit.
If an equipmentrack is used,we recommend locatingthe amp-
lifier(s) in thebottom of therack and thepreamplifier or other
sensitive equipment atthe top.
WATCH FOR THESE SYMBOLS:
The exclamation pointtriangle is usedto alert theuserto impo-
rtant operating ormaintenance instructions.
The lightning bolttriangle is usedto alert theuser to therisk of
electric shock.
Important SafetyInstructions

M Series Power Amplifiers
Operation Manual page 3
CE Declaration of Conformity
Equipment Type:Audio Power Amplifiers
Model Names:M2000
This product hasbeen assessed againstthe following applicableStandards,
EMC (89/336/EEC Electromagneticcompatibility):
EN55013:2001 Sound andtelevision broadcast receiversand associated equipment- Radio disturbance characteristics -Limits and methodsof measurement
EN 55020:2002 Soundand television broadcastreceivers and associatedequipment - Immunitycharacteristics - Limitsand methods ofmeasurement
EN 61000-3-2:2000
Part 3-2: Limits- Limits forharmonic current emissions(equipment input currentup to andincluding 16 Aper phase)
EN 61000-3-3:1995
Part 3-3: Limits- Limitation ofvoltage changes, voltagefluctuations and flickerin public low-voltage supplysystems, for equipmentwith rated current 16 A per
phase and notsubject to conditionalconnection
LVD (73/23/EECLow VoltageDirective)
EN60065:2002 Audio, Videoand similar electronic-safetyrequirements.

page 4 Operation Manual
Table of Contents
Important Safety Instructions.......................................................2
Declaration of Conformity............................................................3
1 Welcome .................................................................................5
1.1 Features ...............................................................................5
1.2 How toUse This Manual..........................................................5
2 Setup ......................................................................................6
2.1 Unpack YourAmplifier ............................................................6
2.2 Install YourAmplifier .............................................................6
2.3 Ensure ProperCooling ............................................................6
2.4 Choose InputWire and Connectors ...........................................7
2.5 Choose OutputWire and Connectors .........................................7
2.6 Wire YourSystem ...................................................................8
2.6.1 Stereo Mode.......................................................................8
2.6.2 Parallel Mode.....................................................................9
2.6.3 Bridge-Mono Mode ...........................................................10
2.6.4 Low CutMode.....................................................................10
2.6.5 Low Pass Mode..................................................................10
2.6.6 limiter Mode..................................................................10
2.7 Connect toAC Mains .............................................................11
2.8 Startup Procedure ................................................................11
3 Operation ..............................................................................12
3.1 Precautions ........................................................................ 12
3.2 Front PanelControls and Indicators ...................................... 13
3.3 Back PanelControls and Connectors...................................... 13
4 Advanced Features and Options ...............................................14
4 Advanced Features and Options ...............................................15
M SeriesPower Amplifiers

1 Welcome
The M Seriesof power amplifiersfrom AT
audio represents anew era inaffordable,
quality power amplification.The line con-
sists of threemodels in auniform, rugged
chassis, incorporating thebest of tried-and
-true design principlesand innovative fea-
tures.
Modern power amplifiersare sophisticated
pieces of engineeringcapable of producing
extremely high powerlevels. They mustbe
treated with respectand correctly installed
if they areto provide themany years ofrel-
iable service for whichthey were designed.
In addition, MSeries amplifiers includea
number of featureswhich require someex-
planation before theycan be usedto their
maximum advantage.
Please take thetime to studythis manual
so that youcan obtain thebest possible se-
rvice from your amplifier.
Operation Manual page 5
1.1 Features
Accurate, uncolored soundwith very low
distortion for thebest in musicand voice
reproduction.
Bridge-mono/stereo mode switchallows
your amplifiers/speakers tobe set upin
the configuration thatbest suits your
needs.
Advanced protection circuitryguards a-
gainst shorted outputs,open circuits,
DC, mismatched loads,general overhe-
ating, high-frequency overloadsand I-
nternal faults.
Extremely versatile, handlinga wide ra-
nge of speakerimpedances and outputs.
Features Limit Switch
Low Cut by24dB/Octave Linkwitz-Riley
Filter
Low Pass by24dB/Octave Linkwitz-Riley
Filter
Switchable input sensitivity.
Proportional speed fanoptimizes cooli-
ng efficiency.
Can be mountedin EIA standard
or stacked ontop of eachother.
19-in.
Rack,
Features both standard5-way binding
posts and genuine Speakon output co-
nnectors. XLR inputs.
1.2 How to Use This Manual
This manual providesyou with thenecessa-
ry information tosafely and correctlysetup
and operate youramplifier.It does notcover
every aspect ofinstallation, setup oroper-
ation that mightoccur under everycondition.
We strongly recommend you readall instr-
uctions, warnings andcautions contained
in this manual.
4-ohm Stereo 1600W
8-ohm Stereo 1000W
8-ohm Bridge-Mono 3000W
*1KHz Power:refers tomaximum average power in
watts at 1KHzwith 1.0% THD.
M2000
M Series Power Amplifiers
dB
0
8
-
dB
0
8
-
I
O
PROTECT
CLIP
SIGNAL
ACTIVE
PROTECT
CLIP
SIGNAL
ACTIVE
POWERCH A CH B
M2000

page 6 Operation Manual
2 Setup
2.1 Unpack Your Amplifier
Please unpack andinspect your amplifierfor any damage
that may haveoccurred during transit.If damage isfound,
notify the transportationcompany immediately.. Save the
shipping carton asevidence of damagefor the shipper s
inspection.
We also recommendthat you saveall packing materials so
you will havethem if youever need totransport the unit.
Never ship theunit without thefactory pack.
YOU WILL NEED(not supplied):
Output wiring cables
Input wiring cables
Rack for mountingamplifier (or astable surface for
stacking)
WARNING: Before youstart to set up your
amplifier,make sure youread and observe
the Important SafetyInstructions found at
the beginning ofthis manual.
2.2 Install Your Amplifier
CAUTION: Before youbegin, make sureyourampli-
fier is disconnectedfrom the powersource, with
the power switchin the off position and all
level controls turnedcompletely down (counterc-
lockwise).
Use a standard equipment rack (EIARS-
310B). See Figure2.1 for amplifierdimensions.
19-inch (48.3 cm)
You may alsostack amps withoutusing a cabinet.
NOTE: When transporting,amplifiers should besupported
at both frontand back.
2.3 Ensure Proper Cooling
When using anequipment rack, mountunits directly ontop
of each other. Close anyopen spaces inrack with blankpa-
nels. DO NOTblock front, rearor side airvents. The sidew-
alls of therack should bea minimum oftwo inches (5.1cm)
away from theamplifier sides, andthe back ofthe rack sh-
ould be aminimum of fourinches (10.2 cm)from the amp-
lifier back panel.
Figure 2.1
Dimensions
483.0 mm
462.0 mm
88.0 mm
M SeriesPower Amplifiers
dB
0
8
-
dB
0
8
-
I
O
PROTECT
CLIP
SIGNAL
ACTIVE
PROTECT
CLIP
SIGNAL
ACTIVE
POWERCH A CH B
M2000

Operation Manual page 7
2 Setup
Figure 2.2
Balanced Input
Connector Wiring
Figure 2.3
Unbalanced Input
Connector Wiring
Figure 2.4
Left: Speakon Output Connector on Back Panel
Right: Speakon Cable Connector
OUTPUT ASSIGNMENT
PIN 1+ :
PIN 1- :
SIGNAL
GROUND
PIN 1+ :
PIN 1- :
SIGNAL
GROUND
PIN 1+ :
PIN 1- :
SIGNAL
GROUND
OUTPUT A
OUTPUT B
BRIDGE
2.4 Choose Input Wire andConnectors
AT Audio recommendsusing pre-built orprofessionally
wired, balanced line(two-conductor plus shield), 22-24
gauge cables andconnectors. Depending uponwhich am-
plifier input youchoose, you shoulduse either 3-pinmale
XLR connectors, TRSphone connectors, orterminal forks
at the amplifierinputs.
Unbalanced line mayalso be usedbut may resultin noise
over long cableruns.
Note: Amplifier inputconnectors not usedfor audio signal
input may beused for daisy-chainingof the audiosignal
to other components.
Figure 2.2 showsconnector pin assignmentsfor balanced
wiring, and Figure2.3 shows connectorpin assignments
for unbalanced wiring.
NOTE: Custom wiringshould only beperf-
ormed by qualifiedpersonnel.
2.5 Choose Output Wire andConnectors
AT Audio recommendsusing pre-built orprofessionally
wired, highquality, two- or four-conductor, heavy gauge
speaker wire andconnectors. Youmay use two4-pole Spe-
akon connectors (Figure2.4and Table1) or bananaplugs,
spade lugs, To prevent thepossibility of short-circuits,wr-
ap or otherwise insulateexposed loudspeaker cablecon-
nectors. Using the guidelinesbelow, selectthe appropriate
size of wirebased on thedistance from amplifier
to speaker.
Distance Wire Size
up to 25ft. 16 AWG
26-40 ft. 14AWG
41-60 ft. 12AWG
61-100 ft. 10AWG
101-150 ft. 8AWG
151-250 ft. 6AWG
CAUTION: Never useshielded cable foroutput wiring.
M Series Power Amplifiers

OFF 80Hz 125Hz
LOWPASS - A
LINK A
LINK B
INPUT A
INPUT B
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
OFF 35Hz 80Hz
HIGHPASS -A
STEREO PARALLEL BRIDGE
MODE
OUTPUT B
Push To Reset
26dB
32dB
0.775V
GAIN
~2202 40V16A 50/60Hz
OUTPUT A
35Hz
HIGHPASS -B LIMITER
OFFON
80Hz
LOWPASS -B GROUND
LIFT GROUND
21 000W
21 600W
OFF 80Hz
OFF 125Hz
N15067
M2000
1+ Channel B Positive
1- Channel B Negative
2+Bridge Positive
2- Bridge Negative
1+ Channel A Positive
1 - ChannelA Negative
2+ Channel B Positive
2- Channel B Negative
R
Speakon 1
R
Speakon 2
page 8 Operation Manual
2 Setup
2.6 Wire Your System
2.6.1 Stereo Mode
SPEAKERS
Figure 2.5
System Wiring, Stereo Mode
Typical inputand output wiringis shown inFigure 2.5.
M SeriesPower Amplifiers
MODE
STEREO PARALLEL BRIDGE

OFF 80Hz 125Hz
LOWPASS - A
LINK A
LINK B
INPUT A
INPUT B
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
OFF 35Hz 80Hz
HIGHPASS -A
STEREO PARALLEL BRIDGE
MODE
OUTPUT B
Push To Reset
26dB
32dB
0.775V
GAIN
~2202 40V16A 50/60Hz
OUTPUT A
35Hz
HIGHPASS -B LIMITER
OFFON
80Hz
LOWPASS -B GROUND
LIFT GROUND
21 000W
21 600W
OFF 80Hz
OFF 125Hz
N15067
M2000
1+ Channel B Positive
1- Channel B Negative
2+Bridge Positive
2- Bridge Negative
1+ Channel A Positive
1 - ChannelA Negative
2+ Channel B Positive
2- Channel B Negative
R
Speakon 1
R
Speakon 2
Operation Manual page 9
2 Setup
2.6.2 ParallelMode
SPEAKERS
Figure 2.6
System Wiring, Parallel Mode
Typical inputand output wiringis shown inFigure 2.6.
M Series Power Amplifiers
MODE
STEREO PARALLEL BRIDGE

OFF 80Hz 125Hz
LOWPASS - A
LINK A
LINK B
INPUT A
INPUT B
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
OFF 35Hz 80Hz
HIGHPASS -A
STEREO PARALLEL BRIDGE
MODE
OUTPUT B
Push To Reset
26dB
32dB
0.775V
GAIN
~2202 40V16A 50/60Hz
OUTPUT A
35Hz
HIGHPASS -B LIMITER
OFFON
80Hz
LOWPASS -B GROUND
LIFT GROUND
21 000W
21 600W
OFF 80Hz
OFF 125Hz
N15067
M2000
1+ Channel B Positive
1- Channel B Negative
2+Bridge Positive
2- Bridge Negative
1+ Channel A Positive
1 - ChannelA Negative
2+ Channel B Positive
2- Channel B Negative
R
Speakon 1
R
Speakon 2
page 10 Operation Manual
2 Setup
2.6.3 Bridge-Mono Mode
2.6.4 Low Cut Filter
2.6.5 Low Pass Filter
2.6.6 Limiter
SPEAKERS
Figure 2.7
System Wiring, Bridge-MonoMode
Typical inputand output wiringis shown inFigure 2.7.
Low Cut Filtercuts off signalfrequency below 30/80Hzor 50Hz
to avoid itmuddy your soundwhen this amplifiermatching
some full rangespeakers.
Low Pass Filter lets itcan only responsefrequency below
80Hz or 125Hzwithout extra crossoverswhen matching
subwoofers.
To avoidserious clips whenlong term operationat dynamic
signal input.
M SeriesPower Amplifiers
MODE
STEREO PARALLEL BRIDGE

Operation Manual page 11
2.7 Connectto AC Mains
2 Setup
Connect your amplifierto the ACmains power source(po-
wer outlet) withthe supplied ACpower cordset. First,co-
nnect the IECend of thecordset to theIEC connector on
the amplifier; then,plug the otherend of thecordset to
the AC mains.
WARNING: The thirdprong of this connector(grou-
nd) is animportant safety feature.Do not attempt
to disable thisground connection byusing an ad-
apter or othermethods.
Amplifiers don t create energy. The ACmains voltage and
current must besufficient to deliverthe power youexpect.
You must operate your amplifierfrom an ACmains power
source with notmore than a10% variation aboveor a 15%
variation below theamplifier s specified linevoltage
and within thespecfied frequency requirements(indicated
on the amplifier s back panellabel). If youare unsure of
the output voltageof your ACmains, please consultyour
electrician.
2.8 Startup Procedure
Use the followingprocedure when firstturning on your
amplifier:
1. Turndown the levelof your audiosource.
2. Turndown the levelcontrols of theamplifier.
3. Turnon the Power switch. The Powerindicator
should glow.
4. Turnup the levelof your audiosource to anoptimum
level.
5. Turnup the Levelcontrols on theamplifier until the
desired loudness orpower level is achieved.
6. Turndown the levelof your audiosource to itsnormal
range.
If you everneed to makeany wiring orinstallation changes,
do not forget todisconnect the powercord.
M Series Power Amplifiers

page 12 Operation Manual
3 Operation
3.1 Precautions
Your amplifier isprotected from internaland external
faults, but youshould still takethe following precautions
for optimum performanceand safety:
1. Before use,your amplifier firstmust be configuredfor
proper operation, includinginput and outputwiring
hookup. Improper wiringcan result inserious operat-
ing difficulties.
2. Use carewhen making connections,selecting signal
sources and controllingthe output level.The load you
save may beyour own!
3. Do notshort the groundlead of anoutput cable tothe
input signal ground.This may forma ground loopand
cause oscillations.
4. WARNING:Never connect the output
to a power supply, batteryor power
main. Electrical shock may result.
5. Tamperingwith the circuitry, or makingunauthorized
circuit changes maybe hazardous andinvalidates all
agency listings.
6. Do notoperate the amplifierwith the redClip LEDs
constantly flashing.
7. Do notoverdrive the mixer, which willcause clipped
signal to besent to theamplifier.Such signals willbe
reproduced with extremeaccuracy,and loudspeaker
damage may result.
8. Do notoperate the amplifierwith less thanthe rated
load impedance. Dueto the amplifiers output prot-
ection, such aconfiguration may resultin premature
clipping and speakerdamage. Remember: AT is not
liable for damagethat results fromoverdriving other
system components.
Remember: ATAudio is notliable for da-
mage that results from overdriving other sy-
stem components.
M SeriesPower Amplifiers

dB
0
8
-
dB
0
8
-
I
O
PROTECT
CLIP
SIGNAL
ACTIVE
PROTECT
CLIP
SIGNAL
ACTIVE
POWERCH A CH B
M2000
OFF 80Hz 125Hz
LOWPASS -A
LINK A
LINK B
INPUT A
INPUT B
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
PIN1:
PIN2:
PIN3:
SIGNAL GND
SIGNAL +
SIGNAL -
OFF 35Hz 80Hz
HIGH PASS-A
STEREO PARALLEL BRIDGE
MODE
OUTPUT B
Push To Reset
26dB
32dB
0.775V
GAIN
~2202 40V 16A 50/60Hz
OUTPUT A
35Hz
HIGH PASS-B LIMITER
OFFON
80Hz
LOWPASS -B GROUND
LIFT GROUND
21 000W
21 600W
OFF 80Hz
OFF 125Hz
N15067
M2000
1+ Channel B Positive
1 - Channel B Negative
2+ Bridge Positive
2 - Bridge Negative
1+ Channel A Positive
1 - Channel A Negative
2+ Channel B Positive
2 - Channel B Negative
R
Speakon 1
R
Speakon 2
Operation Manual page 13
3 Operation
2
Power Switch Ch-B Power
Indicator
3.2 Front Panel Controlsand Indicators
3.3 Back Panel Controlsand Connectors
1
Ch-A Level
Control
Ch-B Level
Control
4
Ch-A Signal,
Clip& PROT
Ch-A Power
Indicator
8
Inputs(XLR)
9Outputs(XLR)
14
20 Reset Switch
21 IEC Power Cord
Connector
Ch-A
Output
Ch-B
Output
Ground lift switch
Limiter switch
17 Input Sensitivity
Switch
Stereo/Parallel/
Bridge Switch
Low pass-B
switch
High pass-B
switch
High pass-A
switch
Low pass-A
switch
Ch-B Signal,
Clip& PROT
M Series Power Amplifiers

page 14 Operation Manual
4 Specifications
M SeriesPower Amplifiers
Minimum GuaranteedPower
Performance
Damping Factor (8ohm): 20 Hzto 400 Hz
Low Cut:Linkwitz-Riley(24dB/Octave)
Low Pass:Linkwitz-Riley(24dB/Octave)
1 kHz with0.5% THD
Stereo, 4 ohms(per ch.)
Stereo, 8 ohms(per ch.)
Bridge mono, 8ohms
1600W
1000W
3000W
Sensitivity (volts RMS)for full ratedpower at 8ohms
Frequency Response(at 1 watt,20Hz - 25kHz)
Phase Response(at 1 watt, 20Hz to20 kHz)
Signal to NoiseRatio belowrated power
A-weighted
Total HarmonicDistortion (THD) at1 full bandwidthpower,
from 20 Hzto 20 kHz
Intermodulation Distortion (IMD)60 Hz and7 kHz at4:1,
from full ratedoutput to -35dB
Crosstalk (below ratedpower,20 Hz to20 kHz)
Common Mode Rejection (CMR)(20 Hzto 1 kHz)
DC Output Offset(Shorted input)
Input Impedance (nominallybalanced, nominally unbalanced)
Voltage Gain (atmaximum level setting) 41.2dB gain at0.775volt sensitivity
0.775V, 32dB,26dB
+0dB, -0.5dB
+10 ,-20
Off/80Hz/125Hz
Off/35Hz/80Hz
760
-65dB
-60dB
107dB
0.1%
10mV
0.05%
20 kilohms, 10kilohms
M2000
M2000

Operation Manual Page 15
4 Specifications
M Series Power Amplifiers
Minimum GuaranteedPower
Construction
Performance
AC Line Voltageand Frequency ConfigurationsAvailable ( 10%)
AC Line Current(both amplifiers drawno more than90 watts atidle)
Ventilation
Cooling
Dimensions
Weight
Net
Shipping
H W D: 89mm 483mm 462mm
Flow-through ventilation from frontto back
Proportional speed fan
15A
23kg
26kg
~220-240 V and50/60 Hz
Load Impedance (Note:Safe with alltypes of loads)
Stereo
Bridge Mono
4-8 ohms
8 ohms
M2000M2000
M2000