Carvin DCM4000 Owner's Manual

SAFETY INSTRUCTIONS (EUROPEAN)

The conductors in the AC power cord are colored in accordance with the following code.

GREEN & YELLOW—Earth BLUE—Neutral BROWN—Live

U.K. MAIN PLUG WARNING: A molded main plug that has been cut off from the cord is unsafe. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERTA DAMAGED OR CUT MAIN PLUG INTO A POWER SOCKET.

IMPORTANT! FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:

WATER AND MOISTURE: Appliance should not be used near water (near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.

POWER SOURCES: The product should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.

GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization is not defeated.

POWER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.

SERVICING: The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.

FUSING: If your unit is equipped with a fuse receptacle, replace only with the same type fuse. Refer to replacement text on the unit for correct fuse type.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL! THIS UNIT CONTAINS HIGH VOLTAGE INSIDE!

REPLACEMENT PARTS LIST FOR DCM4000 AMP

This symbol is intended to alert the user to the presence of uninsulated

“dangerous voltage” within the prod-

uct’s enclosure that may be of suffi-

cient magnitude to constitute a risk of

electric shock to persons.

This symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

CARVIN ENGINEERING DATA

OPERATING MANUAL

The DCM4000 was designed for pro sound companies and individuals who require huge amounts of clean RMS power to drive large, professional speaker systems and arrays, as well as high powered monitor systems. This was the main idea and motivation behind the concept of the

DCM4000: Twice the power - same number

of rack spaces. Another advantage of the

DCM4000 was even more obvious -

1400 Watts x 2 at 8 ohms in bridge mode!

A TON OF POWER X 4

Each DCM4000 incorporates four separate 1000 Watt RMS amps and is powered by redundant toroid power supplies that are totally independent of each other. It’s like having two complete 2000 watt amps in one 3 space package. The only thing they share is the AC cord so if one of the two primary fuses fails, the other amps are not affected. These four amps can be used to power four separate speakers from four different sources (this is ideal for monitor systems). Each side can be bridged to become two 2000 Watt amps (great for high powered speakers and subwoofers like the Carvin TCS series). Each side can even be paralleled and then chained together to be fed by a single input source (perfect for arrays with a large number speakers).

AWESOME SOUND!

What good is a ton of power if it doesn’t sound great? The Carvin DCM4000 is an incredibly transparent amp sporting slew rates well over 50 VmS. With massive dual power supplies and huge reserve capacitors for on-demand power, the DCM4000 delivers pure, uncolored sound at full output; with tight, punchy lows and open, transparent highs – without a hint of distortion.

RUGGED TO THE EXTREME

These pro amplifiers are completely protected from any kind of abuse that might pop up in a typical road rig – thermal, over-current, short-circuit, voltage spikes, “hot-swapping” speakers – the

DCM4000 is designed to protect itself and be right back up and running as soon as the problem is remedied. The all-steel, front & rear rack-able chassis can take whatever abuse is thrown at it. These amplifiers are just what the real pro wants - “rack’em and forget’em”.

COOLEST COOLING

Carvin’s exclusive “Wind-Tunnel” heat-sink with dual “push/pull” 105 CFM fans, ensures full, uninterrupted RMS power delivery without over-heating concerns. These are continuous-duty amps meaning that if you drive them at full power, 24 hours a day, they won’t shut down. And, be assured that you’ll get your full power in RMS watts, not pulse or peak power.

DISTORTION-FREE LIMITERS

The purpose of a limiter is to hold down peaks so the amp won’t distort even with extra hot input signals (this protects your expensive speakers). In addition, a well designed limiter can increase your amp’s average output as much as 3 db. Part of Carvin’s design uses the more expensive, distortion-free linear “opto isolators”. Unlike amps that use FET controlled limiters which can inject small amounts of distortion, the DCM Series limiters keep your sound pure and uncolored!

FRONT & REAR PANELS

Along with the normal Gain controls and Signal, Clip, and Power indicators, we’ve included a very useful “Bridge Mode” indicator to avoid inconvenient or even costly

hook-up mistakes. On the back panel you get a male and female XLR input per amp (perfect for daisy-chaining amps). The

DCM4000 features a speaker output section with professional high current Twist-Lok and Banana/Binding Post connectors to mate with any pro speaker rig. Each dual-amp side features switches for Bridging, Parallel input, Ground Lift, Limiter, and Sub-sonic filter.

RECEIVING INSPECTION

INSPECT YOUR SPEAKER FOR ANY DAMAGE which may have occurred during shipping.

If any damage is found, please notify the shipping company & CARVIN.

SAVE THE CARTON & ALL PACKING MATERIALS. In the event you have to re-ship your unit, always use the original carton and packing material. This will provide the best possible protection during shipment. CARVIN and the shipping company are not liable for any damage caused by improper packing.

SAVE YOUR INVOICE. It will be required for warranty service if needed in the future.

SHIPMENT SHORTAGE. If you find items missing, they may have been shipped separately. Please allow several days for the rest of your order to arrive before inquiring.

RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this manual for your records. Keep your portion of the card and return the portion with your name and comments to us. Or you may register online at www.carvin.com/registration

DCM POWER AMP SPECIFICATIONS:

MODEL DCM4000

Bridged RMS Continuous

4Ω, (1k Hz, <1.0%) 2000w x 2 8Ω, (1k Hz, <1.0%) 1400w x 2

All Channels RMS Continuous

2Ω (1k Hz, <1.0%) 1000w x 4 4Ω (1k Hz, <1.0%) 700w x 4 8Ω (1k Hz, <1.0%) 425w x 4

THD (Typical—1/2 power): 0.03% Damping Factor: >500 Slew Rate: bridged mode 50v/µs Sensitivity: (4Ω, Vms) 1.0 V Signal to Noise Ratio: Above 100dB Frequency Response: ±0.5 dB, 20 Hz to 20kHz (±1.5 dB, 10 Hz & 40 kHz) Input Impedance: 20K Ω, balanced

Protection Circuits: • Short Circuit • No Load Protection • SpeakerGuard™

• Thermal Shut-Off • Mute On/Off

Controls and Indicators Front: • Power switch • Recessed attenuators • Signal LED • Clip LED • Protect LED

• Power ON Indicator • Bridge Indicator

Rear: Ground Lift (each channel) • Parallel Input Switch • Speaker Output Bridge

Switch • Limiters IN/OUT Switch • Lo cut Switch • Input Connectors: Four each;

Balanced Male and Female XLR • Speaker Output Connectors: Dual heavy-dubinding posts, six Twist-Lok (two bridgeed).

Dimensions: 5 1/4" High x 19" Wide x 16" Depth (3-space) Net Weight: 70 lbs. Power : TWO 120 VAC 15 amp circuit minimum. (20 amp recommended)

TWO 240 VAC 10 amp circuit minimum. (15 amp recommended).

(Note: You may plug both cords into a dedicated 20 amp circuit when using reduced loads. You may use 8Ω loads at moderate levels. However, 2Ω, 4Ω or bridged loads at higher levels will cause a single

20 amp circuit breaker to trip.)

76-04008A 1002

12340 World Trade Drive, San Diego, CA 92128

800.854.2235 www.carvin.com

For your records, you may wish to record the following information.

Serial No._____________________ Invoice Date________________________

DCM4000 POWER AMP

LIMITED WARRANTY

Your Carvin amplifier is guaranteed against failure for 3 YEARS unless otherwise stated. Carvin will service and supply all parts at no charge to the customer providing the unit is under warranty. Shipping costs are the responsibility of the customer. CARVIN DOES NOT PAY FOR PARTS OR SERVICING OTHER THAN OUR OWN. A COPY OF THE ORIGINAL INVOICE IS REQUIRED TO VERIFY YOUR WARRANTY. Carvin assumes no responsibility for horn drivers or speakers damaged by this unit. This warranty does not cover, and no liability is assumed, for damage due to: natural disasters, accidents, abuse, loss of parts, lack of reasonable care, incorrect use, or failure to follow instructions. This warranty is in lieu of all other warranties, expressed or implied. No representative or person is authorized to represent or assume for Carvin any liability in connection with the sale or servicing of Carvin products.

CARVIN SHALL NOT BE LIABLE FOR INCIDENTAL OR CON-

SEQUENTIAL DAMAGES.

When RETURNING merchandise to the factory, you may call for a return authorization number. Describe in writing each problem. If your unit is out of warranty, you will be charged the current FLAT RATE for parts and labor to bring your unit up to factory specifications. register online at www.carvin.com/registration.

MAINTAINING YOUR EQUIPMENT

Avoid spilling liquids or allowing any other foreign matter inside the unit. The panel of your unit can be wiped from time to time with a dry or slightly damp cloth in order to remove dust and bring back the new look.

As with all pro gear, avoid prolonged use in caustic environments (salt air). When used in such an environment, be sure the amplifier is adequately protected by rack, covers, etc..

DCM4000

03-00220 4 “INSLTR MICA .0030””.450””X .65”””

03-00503 4 “INSULATOR .36X .36X .20”” 85deg”

03-92521 12 STANDOFF LED .925 x .215 T1

06-10028 24 MS PPH 4-40X .500 ZINC TYPE F

06-40050 3 TERMINAL VERT MALE PC MTG .250

“QC1,QC2,QC3”

06-40060 5 TERMINAL 90dg MALE PC MTG .250

“QC4,QC5,QC6,QC7,QC8”

07-01602 1 “KNOB “”6”” 6x6x9.7mm GREY CAP”

07-01603 4 “KNOB “”6L”” 6x6x17.4mm GREY CAP”

12-40000 1 “HEATSINK 12”” LENGTH ALUMINUM”

12-57462 1 HEATSINK VERT W/TABS T0-220

15-00105 2 COIL AIR 1.5uH 14AWG “L100,L200”

21-40000 2 XLR FEML CON NEUTRIK #NC3FAV-0

“J100,J200”

21-40001 2 XLR MALE CONNECTOR “J101,J201”

21-45000 3 TWIST-LOK 4-POLE PCMTG #NL4MD-V

“J1,J102,J202”

23-03529 2 FUSEHOLDER CLIPS 3AG VERT MTG F1

23-08604 3 “CONNECT HEADER .086”” 4 PIN” “H2,H7A,H7B

(SECONDARY)”

23-08605 2 “CONNECT HEADER .086”” 5 PIN” H3

23-10002 3 “CONNECT HEADER .100”” 2 PIN” “H4,H9,H10”

23-11002 3 CONNECT HEADER 2 PIN STRAIGHT

“H5,H8A,H8B”

23-11004 4 CONNECT HEADER 4 PIN STRAIGHT

“H2A,H2B,H5A,H5B”

23-11010 6 CONNECT HEADER 10 PIN STRAIGHT

“H1A,H1B,H3A,H3B,H4A,H4B”

25-02201 4 SWITCH DPDT PUSH PC MTG LOCKNG

“S1,S2,S4,S5”

25-04201 1 SWITCH 4PDT PUSH PC MTG LOCKNG S3

30-04008B 1 PCB CARD MAIN DCM4000

41-47322-1 3 CAP MYLR .0470UF 250VAC BOX “C1,C2,C3”

42-10312 4 “CAP ELEC 10,000 MFD 100V 20%” “C12,C13,C14,C15”

44-13520 4 “JUMPER PCB 20AWG .350”” X .175”””

“B1,B2,B3,B4”

46-10412-1 2 CAP POLY .1000UF 100V 10% “C130,C230”

46-47312-1* 3 CAP POLY .0470UF 100V 10% PREP

“C6,C7,C8”

47-10235-1 4 “CAP ELEC 1,000 MFD 35V 20%” “C5,C9,C10,C11”

47-47125-1* 1 CAP ELEC 470 MFD 25VOLT 20% C24

47-47151-1* 1 CAP ELEC 470 MFD 50 VOLT 20% C4

49-10212 2 0.001UF SMT 10% FILM 0805 50V “C147,C247”

49-10451 4 0.1 uF SMT 10% FILM 1206 50V

“C20,C22,C103,C203”

49-22035 15 SMT CAP 22uF 35v ELECTROLITIC

“C23,C102,C122,C124,C142,C146,C148,C202,

C22,C242,C246,C248,C16,C17”

49-22212 1 0.0022UF SMT 10% FILM 0805 50VC21

49-27052 20 27 PF SMT 5% CERAMIC 0805

“C100,C101,C104,C105,C106,C120,C121,C123,

C11,C200,C201,C204,C205,C206,C220,C221,C223,C21”

49-33312 4 0.033UF SMT 10% FILM 0805 50V

“C151,C152,C251,C252”

49-39052 2 39PF SMT 5% CERAMIC 0805 “C143,C243”

49-47312 4 0.047UF SMT 10% FILM 0805 50V

“C107,C145,C207,C245”

49-56152 4 560PF SMT 5% CERAMIC 0805

“C149,C150,C249,C250”

49-82052 2 82PF SMT 5% CERAMIC 0805 “C144,C244”

50-10035 2 RES 1.00KOHM .25W 5% CARBON

“R7,R142”

50-10045 1 RES 10.00KOHM .25W 5% CARBON

R140

50-22045 2 RES 22.00KOHM .25W 5% CARBON

“R8,R141”

52-10015-1 1 RES 10.00 OHM .50W 5% CARBON R6

53-22025-1* 4 RES 220.00 OHM 1.00W 5% CBN .3

“R168,R171,R268,R271”

54-02206 24 RES .22 OHM 3.00W 5% BOX

“R172,R173,R174,R175,R176,R177,R178,

R179,R180,181,R182,R183,R272,R273,R274,

R275,R276,R277,R278,R279,R280,R281,R282,R283”

54-10015-2 4 RES 10.00 OHM 2.00W 5% CARBON

“R169,R170,R269,R270”

55-15003-1 2 1.5k 5w WIRE LEAD RESISTOR “R3,R4”

55-05025 4 RES 5.00 OHM 5W 5% SB VERT

“R143,R144,R243,R244”

56-35010 1 RES 350.00 OHM 10W 10% SB SDOF R5

58-10025 6 100.5 SMT .25W 1206 1%

“R112,R126,R163,R212,R226,R263”

58-10035 6 1K SMT .25W 1206 1%

“R11,R115,R157,R215,R257,R30”

58-10045 35 10K SMT .25W 1206 1%

“R12,R13,R17,R28,R31,R100,R101,R102,R103,

R120,R121,R127,R128,R150,R152,R153,R167,

R185,R187,R200,R201,R202R,203,R220,R221,

R227,R228,R250, R251,R252,R253,R267,R285,R287”

58-10055 9 100K SMT .25W 1206 1%

“R18,R129,R159,R188,R190,R229,R259,R288,R29”

58-10065 2 1M SMT .25W 1206 1% “R114,R214”

58-15025 2 150ohm SMT .50W 1206 1% “R164,R264”

58-15045 9 15K SMT .25W 1206 1%

“R25,R122,R123,R184,R186,R222,R223,R284,R28”

58-15055 3 150K SMT .25W 1206 1% “R9,R27,R209”

58-18035 1 1.8K SMT .25W 1206 1% R131

58-22035 10 2.2K SMT .25W 1206 1%

“R2,R32,R110,R111,R132,R193,R210,R211,R232,R293”

58-22045 7 22K SMT .25W 1206 1%

“R107,R109,R154,R158,R207,R254,R258”

58-22055 7 220K SMT .25W 1206 1%

“R15,R156,R191,R192,R256,R291,R292”

58-27025 6 270.5 SMT .25W 1206 1%

“R106,R162,R165,R206,R262,R265”

58-33035 2 3.3K SMT .25W 1206 1% “R161,R261”

58-33045* 1 33K SMT .25W 1206 1% R21

58-36055 4 365K SMT .25W 1206 1%

“R105,R113,R205,R213”

58-47025 1 470.5 SMT .25W 1206 1% R16

58-47035 6 4.7K SMT .25W 1206 1%

“R1,R19,R20,R29,R166,R266”

58-47045 11 47K SMT .25W 1206 1%

“R10,R108,R124,R125,R155,R160,R208,R224,

R225,R255,R260”

58-47055 3 470K SMT .25W 1206 1% “R23,R26,R130”

58-56025 1 560.5 SMT .25W 1206 1% R24

58-68035 3 6.8K SMT .25W 1206 1% “R14,R104,R204”

58-91025 1 910.5 SMT .25W 1206 1% R22

60-00014 1 TRANS MPSA14 DRLNGTN NPN T0-92 Q2

60-15032 2 TRANS MJE15032 NPN T0-220 “Q112,Q212 (SECONDARY)”

60-15033 2 TRANS MJE15033 PNP T0-220 “Q113,Q213 (SECONDARY)”

60-21193-1* 12 TRNS BIPOLAR MJL21193-PREPPED

“Q114,Q115,Q116,Q117,Q118,Q119,Q214,Q215,

Q216,Q217,Q218,Q219”

60-21194-1* 12 TRNS BIPOLAR MJL21194-PREPPED

“Q120,Q121,Q122,Q123,Q124,Q125,Q220,

Q221,Q222,Q223,Q224,Q225”

60-35041 2 RECTIFIER BRIDGE 35AMP/400V PC

“SECONDARY BR100,BR200”

60-50200 4 DIODE GEN REC 1N5402 3A 200V

“D130,D131,D230,D231”

60-50253 2 OPTO ISOLATOR VACTROL AXIAL “OP100,OP200”

60-54000-1* 2 TRANS 2N5400 AMP PNP T0-92 “Q101,Q102”

60-55500-2* 2 TRANS 2N5550 HV NPN 250V T0-92

“Q111,Q211(SECONDARY, PLACE THROUGH HOLE)”

60-75320 6 LED RED DIFFUSED 3MM T-1.00

“D3,D5,D111,D113,D211,D213”

60-75330 4 LED GREEN DIFFUSED 3MM T-1.00

“D110,D112,D210,D212”

60-75340 3 LED YELLOW DIFFUSED 3MM T-1.00

“D1,D6,D19”

60-78150-1* 1 REG VOLT 15+V 1A (PREPPED) VR1

60-79150-1* 2 REG VOLT 15-V 1A (PREPPED) “VR2, VR3

(WITH HEATSINK)”

61-04733 1 DIODE ZENER 1N4733A 5.1V 1W Z100

61-40030 9 DIODE RECT GEN 1N4003 200V 1A

“D10,D11,D12,D13,D14,D15,D16,D17,D120”

62-00014 2 MMBTA14 SOT-23 SMT “Q100,Q200”

62-19140 16 1N914 HI SPD SMT 250mW DIODE

“D2,D20,D21,D22,D23,D100,D132,D133,D200,

D232,D233,D18,D4,D7,D8,D9”

62-20430 8 NJM2043SMT(TESTED) DUAL HFREQ

“A100,A101,A110,A120,A200,A201,A210,A220”

62-29010 1 NJM2901SMT SNGLE SUPPLY A111

62-45650 2 NJM4565 SMT DUAL HI FREQ “A10,A11”

62-54001 3 MMBT5401LTI PNP SOT-23 SMT “Q126,Q226,Q3”

62-55500 7 MMBT5550 NPN SOT-23

“Q1,Q10,Q110,Q127,Q210,Q227,Q5”

70-05713 2 RELAY SPDT 12A@120VAC/24V COIL

“K100,K200”

70-05715 1 RELAY SPDT 15A@120VAC/24V COIL K1

70-22125 1 FUSE X2: 25Amp 250V Slow Blow MBA

71-09253 2 “POT 9 “”D-P”” 25F B50K-” “P100,P200”

71-24450 2 POT VERT TRIMMER 500ohm “P110,P210”

CH1

CH2 CH3

CH4

PROTECT

ON ON

BRIDGE BRIDGE

∞

5 4

0 dB

∞

5 4

0 dB

∞

5 4

0 dB

∞

5 4

0 dB

DCM4000

4000 Watt Power Amp

CLIP

SIGNAL

CLIP

SIGNAL

CLIP

SIGNAL

CLIP

SIGNAL

PROTECT

BRIDGE BRIDGE

∞

5 4

0 dB

∞

5 4

0 dB

∞

5 4

0 dB

∞

5 4

0 dB

CLIP

SIGNAL

CLIP

SIGNAL

CLIP

SIGNAL

CLIP

SIGNAL

FRONT & REAR PANEL CONTROLS

15 16 19

TYPICAL BRIDGE STEREO SETUP

TYPICAL STEREO BIAMP SETUP WITH 2 DCM4000

SHIELD

-NEG.

+POS.

SHIELD

-NEG.

+POS.

GND

- SIGNAL (BAL.)

+ SIGNAL (BAL.)

BALANCED MIC/LINE XLR CABLES

(Shielded)

FRONT PANEL

1. MOUNTING

A sturdy one piece 12 guage steel face plate accomodates easy transporting along with facilitating rack installation. The rack mounting holes are designed on ISO standard spacing. Four 10-32 x .5” phillip machine screws are normally used to secure the amp. The rear support brackets must also be used, which are adjustable from a depth of 13” to 19”.

2. POWER SWITCH

Check the power amp connections and verify the AC line power source before engaging the POWER switch. The yellow LED unmistakably indicates that all circuits are properly powered up. Yellow is used so the operator can see the red indicators (clipping or protect) from a distance.

3. CHANNEL LEVEL CONTROL

Precision input LEVEL attenuators are used to adjust the volume levels. To deliver the amps maximum power without reducing the headroom of the signal source, the level controls should be turned full on.

4. CHANNEL SIGNAL INDICATOR

The green SIGNAL LED indicators will start to flash when

there is a signal passing to your speakers (-30dBu).

5. CHANNEL CLIP INDICATOR

The red CLIP LED indicators will start to flash when each channel has reached its maximum output. Occasional flashing caused by lower bass frequencies is OK. However, consistent flashing caused from higher frequencies may damage high frequency drivers (excessive distortion). This does not cause damage to the amp.

6. BRIDGE MODE INDICATOR

This yellow LED will indicate when the rear “bridged” switch has been engaged and you’re running a pair af channels in the “bridge” mode.

7. POWER INDICATOR/FUSES

This Yellow LED will indicate power to each pair of amps. If one pair does not come on, remove the top lid and replace both 25 AMP 250 Volt slow blow MBA fuses located in the center bottom of the amp.

8. FRONT COOLING VENTS/FAN

Upon rack installation, the rear of the amp must be fully exposed to room temperature air. The surrounding air should not be warmer than 120° or the thermal protection will engage. The front cooling vents are not to be restricted from exhausting the warm air.

9. PROTECT LED INDICATOR

The red PROTECT LED provides the operator with information about the status of the amplifier. The PROTECT LED can come on under 3 different conditions (when this happens both channels are muted)

1) During power-up, the amplifier stays in a muted state for approx. 3 sec until it determines that everything is functioning normally (no output shorts or over temp conditions).

2) When the output load draws excessive current or a direct short is detected in a speaker cable or speaker system, reset this condition by turning the amp off for two seconds and then on again. Check for shorted cables and proper impedance (2 ohms minimum per ch or 4 ohms BRIDGED).

3) Overheating is usually determined when the amp stops in the middle of a performance and the PROTECT LED comes on. If this is the case, leave the amp on for the fan to cool the amp down. The amp will automatically reset within 1 to 3 minutes. The PROTECT LED will turn off when ready. Check for the following conditions; a) The rear intake air is restricted, b) The intake air is extremely warm, c) The front exhaust vents are restricted, or d) Excessive speaker load (try other speakers or remove speakers if you are lower than the recommended minimum impedancel).

REAR PANEL

10. XLR CHANNEL INPUTS

Balanced XLR inputs are featured on each channel. Each channel also features an XLR "through" connector for daisy chaining your input signals to other channels or amps. XLR pin configuration. Pin 1: Grounded through the GROUND LIFT switch, Pin 2: positive Bal. signal and Pin 3: negative Bal. signal.

11. SPEAKER OUTPUT CONNECTORS

Each channel has a high current Twist-Lok speaker

connector. A 12 gauge cable is recommended such as Carvin's

SP series cables. Channel pairs 1 and 2, 3 and 4 also have a bridged Twist-Lok connector for bridging the four 1000 watt channels into a pair of 2000 watt outputs. (

see 17 BRIDGE MODE

12. PARALLEL INPUTS

The rear parallel switch for inputs 1 and 2 allows you to feed a single input signal into input 1 and have it also drive input 2 without a "Y" cable (this also applies to inputs 3 and 4 respectively). Push in the parallel switch and plug your input cable into INPUT 1. Channels 1 and 2 will now have the same input signal. Each side of the amp (1 & 2 or 3 & 4) can be set up independently. You can parallel 3 and 4 while leaving 1 and 2 unparalleled and so on. In order to parallel the entire amp, push in both parallel buttons and plug a short XLR cable from channel 2 into channel 3. This will provide the entire amp with the same input signal.

13. INPUT GROUND LIFT

Many times sound systems are connected in such a manner to cause a grounded loop with the inputs that result in audible hum. The input GND LIFT switches on the rear panel will help eliminate this problem. If not, another way to eliminate ground loops is to install a “line matching” transformer between the amplifier input and the signal source and then cut the wires to PIN 1 and ground terminals.

14. LIMITERS

To activate the LIMITERS, engage the rear limiter switches. The built-in high quality limiters are recommended to hold down peaks that could cause early distortion. Limiters will help to raise the average power so that you can get more output. To check the effectiveness of the limiters when the channel starts to distort (under the amps full output), engage the limiters and hear the reduction of the distortion. If the distortion stops, you can turn the channel up for more power. The lower bass frequencies are most affected. WARNING: Do not check in an environment where the sound level could damage your ears!

15. LO CUT

When this mode is engaged it cuts -6dB per/octave @ 30Hz. This helps to eliminate

pops and bumps on vocal mics and stage rumble.

16. SPEAKER OUTPUT BINDING POSTS

Wire sizes up to 7 gauge (50 amps) can be inserted into the binding post “side holes”. Large cables can be used with “banana” plugs which plug into the end of the binding posts (remove colored caps). Binding posts are spaced on ISO standards. Use the two center RED binding posts for BRIDGE speaker connections (see 17 BRIDGE MODE).

17. BRIDGE MODE—25V/70V DISTRIBUTION SYSTEMS

The “DCM” Series can be operated in bridge mode if you require a 25V/70V distribution speaker system or high powered at high output impedances. With your amp off, push in the rear (recessed) BRIDGE switch after you have made your speaker connections. The INPUT and LEVEL is handled by channel 1 and 3. The minimum speaker impedance is 4 ohms. CAUTION: The power developed by bridging your amp can destroy most speaker systems!

18. AC POWER

The DCM4000 requires two 15 - 20 amp AC sockets for the dual toroid power supplies. It is designed to run on either 120V 60Hz or 240V 50Hz depending on the model purchased. For loads less than 8 ohms the AC cords must be pluged into two separate 15 amp “minimum” outlets. Never defeat the grounded connection or electrocution may result!

19. FAN INTAKE

Upon rack installation, the rear of the amp must be fully exposed to room temperature air. The surrounding air should not be warmer than 120° or the thermal protection could activate. The front cooling vents are not to be restricted from exhausting the warm air.

WARNING

This product produces high sound pressure levels that could damage your hearing. Use with caution.

HELPFUL HINTS

1. No sound from Ch 2 or 4:

The rear BRIDGE switch has been inadvertently pushed in.

2. Stereo channels sound the same:

The rear PARALLEL switch has been inadvertently pushed in.

3. No High Frequencies:

Tweeters or midrange drivers have been damaged or blown from feedback or overpowering.

4. System hum:

Try switching the GND LIFT switch IN or OUT (depending on your use).

If the hum is not eliminated, then use a 600Ω line input transformer cutting the input ground on the connectors (Pin 1). This isolates the input ground from the AC power ground.

5. Poor sound (poor bass):

The speaker systems are wired out of phase to each other. To correct, reverse the wires on one speaker connector only and your bass response should improve.

6. Main AC breaker trips:

Each 120VAC DCM4000 amp will require two separate 20 amp circuit (240V: 25 amp) to deliver its full sine wave power with a bench load.

4Ω

XC3000 CROSSOVER

Ch 3

Ch 1

Left Highs

Right Highs

Left lows

Right Lows

BRIDGE switch

must be ON (in)

FULL LOAD SETUP

MULTI AMP INPUT SETUP WITH ONE INPUT SIGNAL

Ch 1

4Ω

PARALLEL switch

must be ON (in)

BRIDGE switch must be ON (in)

2Ω

2000W

“Bridged”

1st amp

2nd amp

XLR

cable

1000W

2Ω

1000W

PARALLEL switch

must be ON (in)

2Ω

1000W

2Ω

1000W

4Ω