Digital Cinema Amplifier QSC DCA 4-channel

Crystal-clear, breathtaking, seat-shaking cinema sound is here with our DCA Series Digital Cinema Amplifiers. These THX approved amplifiers offer superior performance and features designed specifically for the cinema market. All DCA amplifiers feature PowerLight™ switch mode power supply technology and DataPorts for integration with DCP Cinema Processors, or DCM Cinema Monitors.
Five 2-channel and two 4-channel models offer power points from 200 to 1700 watts per channel in a two rack, 21 pound amplifier. With QSC's exclusive PowerLight® switching technology you'll hear ultra-powerful bass and superior highs in every scene.

  • The DCA 1644 is perfect for powering screen channels in small to medium theatres, or for powering mids and highs in tri-amp systems for larger theatres.
  • DCAs are equipped with a DataPort for use with QSC DCM/DCP - Digital Cinema Monitor; Digital Cinema Processor, a total system solution that greatly reduces labor & wiring costs.
  • Compact size (2-RU, 14" deep) ideal for use in console-mounted sound systems
  • All models weigh only 21 pounds, for easier racking and shipping.
  • Active Inrush Limiting won't blow circuit breakers at turn-on.
  • Gain control security cover protects amp from misadjustment.
  • 3 year warranty plus optional 3 year extended service contract!
8Ω, 20 Hz–20 kHz, 0.05% THD Continuous Avg. output per channel
250 W
Continuous Avg. output per channel
170 W
4Ω, 20 Hz–20 kHz 0.1% THD 400 W (1 kHz) 250 W
EIA: 1 kHz, 1% THD @

450 W
not rated

450 W
16Ω, 20 Hz–20 kHz, 0.1% THD 500 W 340 W
8Ω, 20 Hz–20 kHz, 0.1% THD 800 W (0.1% THD, 1 kHz) 500 W
4Ω, 1 kHz, 1% THD not rated 900 W
Signal to Noise
20 Hz–20 kHz, unweighted
- 105 dB - 105 dB
Input Sensitivity
full rated power @ 8 ohms
1.12 V rms 0.93 V rms
Input Sensitivity
full rated power @ 4 ohms
1.0 V rms 0.8 V rms
Output Circuitry Class Type AB+B AB+B
Distortion (SMPTE-IM) < 0.01% < 0.01%
Distortion (Typical)
20 Hz–20 kHz: 10 dB below rated power
1.0 kHz and below: full rated power

Less than 0.02% THD @ 8 and 4 ohms
Less than 0.02% THD @ 8 and 4 ohms
Frequency Response
(LF filter switched off)
20 Hz–20 kHz, ± 0.2 dB
8 Hz–50 kHz, + 0, -3 dB
Damping Factor 1 kHz and below Greater than 500
Input Impedance 10 kΩ unbalanced, 20 kΩ balanced
Input Clipping 10 V rms (+22 dBu)
Cooling Variable-speed fan, rear-to-front air flow
Connectors, each channel

Input: 3-pin detachable terminal blocks
Output: Safety-shrouded barrier strip, including monitor output
DataPort: One HD15 per pair of channels
Voltage Gain at 8 ohms 40x (32 dB)
Controls Front: AC switch, Ch. 1,2,3 and 4 recessed gain knobs
Rear: DIP switch (Clip Limiter on/off, each channel; LF Filter on/off, each channel; LF Filter Freq select 30 or 50 Hz, each channel; Inputs Parallel or Stereo; Bridge Mode)
Indicators 1 each per channel: 
LEVEL -10 dB: Green LED
LEVEL -20 dB: Green LED
SIGNAL -35 dB: Green LED
Amplifier Protection Full short circuit, open circuit, thermal, ultrasonic, and RF protection.
Stable into reactive or mismatched loads.
Load Protection On/off muting, DC-fault power supply shutdown
Dimensions (HWD) inches 3.5 x 19 x 14
Dimensions (HWD) mm 89 x 483 x 356
Weight 21 lb (9.5 kg) net
Optional Accessories
Download the 
Cinema Accessories for DCA Amps User Manual (PDF 410k)
XC-3 Cinema Crossover, for bi-amp applications with all commonly used cinema speakers
SF-3 Subwoofer Filter, an adjustable highpass filter for subwoofers
LF-3 Low Frequency Filter, used with the XC-3 for tri-amp applications