DCM
Specifications
qscaudio.com
Specifications subject to change without notice.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
DCM Spec Sheet - 02/23/06
The QSC DCM acts as the interface between a cinema film audio processor and the power
amplifiers in a bi-amp or tri-amp cinema sound system. The DCM performs two major
functions: automatic and manual monitoring of processor and amplifier signals, and fully
programmable crossover/EQ filtering.
Dimensions (HWD):
5.25" x 19" x 14"
Line Voltage Requirements:
85 VAC - 260 VAC, 50/60 Hz
Accessories Included:
(1) 6 ft. (2m) UL/CSA line cord
(1) User Manual
(1) Software Diskette, 3.5" HD
Front Panel Controls
Power Switch:
(1) Rocker Switch
Monitor Mode Select:
(1) Momentary Push Button
Monitor Channel Select:
(6 or 8) Momentary Push Button
Monitor Volume:
(1) Rotary Potentiometer
Test Lead Connections:
(2) Test Point Jacks
Bypass Mode Select Switch:
(1) Slide Switch
Diagnostics Button:
(1) Momentary Push Button
Indicators:
Power Indicator:
(1) Green LED
Monitor Mode Indicators:
(1) Green LED and (1) Yellow LED
Processor Channel Indicators:
(6 or 8) Green LEDs
Amplifier Channel Indicators:
(13 or 20) Yellow LEDs
Load Fault Indicator:
(1) Red LED
Clip Indicator:
(1) Red LED
Rear Panel Controls
Bypass Crossover Level:
(2 or 3) Rotary Trimpots
Surround EX Mode Switch:
(1) Slide Switch
Rear Panel Control Connectors:
Input:
(1) 25-pin female D-sub connector
Amplifier DataPorts:
(8, 11 or 15) 15-pin female high-density
D-sub connectors
RS232 Serial Port:
(1) 9-pin female D-sub connector
Powered Sub/Hearing:
Impaired Output:
(1) 6 terminal screw-terminal connector
Surround EX Insert Point:
(1) 9-pin male D-sub connector
AC Power Inlet:
(1) IEC style with fuse
DCM Inputs
Screen Channels and Subwoofer:
Input Stage Type:
Active Balanced
Input Impedance:
20k ohms
Maximum Input Level
(Screen channels):
+14.2 dBu (4.0 Vrms)
Maximum Input Level
(Subwoofer channels):
+18.2 dBu (6.4 Vrms)
A/D Conversion
(Screen channels only):
24 bit delta-sigma 128x oversampled
Surround Channels:
Hardwire pass-through to DataPort outputs
(via Surround-EX Insert)
Dataport Outputs
Screen Channels:
Output Attenuation Steps:
0 dB to –18 dB in 0.1 dB steps
Dynamic Range:
99 dB
THD+N 20 Hz-20 kHz, +12 dBu
Input Level, All Filters Flat:
0.02%
Frequency Response:
20 Hz – 20 kHz (no filtering)
D/A Conversion:
24 bit delta-sigma 128x oversampled
Filter Topology:
24 bit digital IIR filters
Crossover Filters:
Linkwitz-Riley 24 dB/octave digital filters
programmable in approx. 1 Hz steps from
150 Hz - 15 kHz
Parametric EQ:
Digital bandpass constant Q filter with ±10 dB
of boost/cut programmable in approx. 1/10 octave
steps from 80 Hz -15 kHz. Q is programmable
in 1/10th octave steps from 1/10 to 2 octaves.
CD Horn EQ:
Available on high frequency outputs only
Screen EQ:
Available on high frequency outputs only
Delay:
Programmable in 21
µ
s steps from 0 to 21 ms
per output
Polarity:
Normal, Inverted
Mute:
Individual mutes on each screen channel output
Subwoofer:
Output Stage Type:
Single ended (balanced impedance)
Output Attenuation Steps:
0 dB to –18 dB in 3 dB steps
Dynamic Range:
99 dB
THD+N 20 Hz-20 kHz, +12 dBu
Input Level, All Filters Flat:
0.02%
Filter Topology:
Digitally controlled analog on DCM-1,
DSP on DCM-3
High Pass Filter:
Linkwitz-Riley 12 dB/octave filter. Q can be
programmed as 0.707 or 2, flat or “step-down”
operation
Mute:
One mute for all subwoofer outputs
Surround Channels:
Hardwire pass-through from processor input via
Surround Insert
Output Channels (using the
Surround Insert connector):
2 or 3 selectable on rear panel
Amplifier A.C. Control
all amps power on with DCM activation
Emergency Bypass Crossover
Filter Type:
1st order Butterworth, 2 or 3 way
Attenuation Range (trimpot):
-6 dB to -24 dB
Powered Subwoofer Output
Output Stage Type:
Single ended (balanced impedance)
Output Impedance:
50
Ω
Maximum Output Level:
+14.2 dBu (4.0 Vrms)
Loading Requirements (total of
remote & dataport connection):
R
MIN
= 2k ohms C
MAX
= 4 nF
Hearing Impaired Output
Output Stage Type:
Single ended (balanced impedance)
Output Impedance:
50
Ω
Nominal Output Level:
-11.8 dBu (200 mVrms)
Loading Requirements:
R
MIN
= 2k ohms C
MAX
= 4 nF
Surround Insert I / O
Output Stage Type:
Hardwired connection to processor
input connector
Input Stage Type:
Hardwired connection to DataPort
output connector
Monitor Speaker
Dimensions:
4-inch full range driver
Amplifier Output Power:
10 watt class AB amplifier
Frequency Response:
100 Hz – 8 kHz (±2 dB)
Dynamic Processing:
1.5:1 compression
