DCA 1644

4-Channel Power Amplifier


FEATURES

  • 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!
SPECIFICATIONS DCA 1644 DCA 1824
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
 BRIDGED MONO MODE  
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%
  BOTH MODELS
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:
CLIP/PROT: Red LED
LEVEL -10 dB: Green LED
LEVEL -20 dB: Green LED
SIGNAL -35 dB: Green LED
BRIDGED: Yellow LED
PARALLEL INPUTS: Yellow LED
POWER ON: 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