CH1
CH2
CH3
CH4
PROTECT
PROTECT
PROTECT
PROTECT
ON
ON
ON
ON
BRIDGE
BRIDGE
BRIDGE
BRIDGE
∞
50
30
22
19
17
15
13
12
11 10 9
8
7
6
5
4
3
2
1
0 dB
∞
50
30
22
19
17
15
13
12
11 10 9
8
7
6
5
4
3
2
1
0 dB
∞
50
30
22
19
17
15
13
12
11 10 9
8
7
6
5
4
3
2
1
0 dB
∞
50
30
22
19
17
15
13
12
11 10 9
8
7
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5
4
3
2
1
0 dB
DCM4000
4000 Watt Power Amp
CLIP
SIGNAL
SIGNAL
CLIP
SIGNAL
SIGNAL
CLIP
SIGNAL
SIGNAL
CLIP
SIGNAL
SIGNAL
2
1
3
4
5
8
FRONT & REAR PANEL CONTROLS
18
14
13
12
15
16
19
17
10
11
9
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 pow-
ered 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 (-30dBM).
5. CHANNEL CLIP INDICATOR
The red CLIP LED indicators will start to flash when each chan-
nel 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 distor-
tion). 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 chan-
nel 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 indepen-
dently. 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 dis-
tortion. 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 imped-
ances. With your amp off, push in the rear (recessed) BRIDGE switch after you have made your speaker con-
nections. 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 a 30 amp industrial NEMA twist-lock AC socket for the dual
toroid power supplies. It is designed to run on either 120V 60Hz or 240V 50Hz depending on the model
purchased. The rear 10 gauge heavy-duty NEMA power cable must be plugged into a 30 Amp twist lock
NEMA socket. Firmly push into the socket and twist clockwise to lock. Never defeat the grounded con-
nection or electrocution may result!
19. FAN INTAKE
Upon rack installation, the rear of the amp must be fully exposed to room tem-
perature air. The surrounding air should not be warmer than 120° or the thermal protection could acti-
vate. 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.
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