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DCA 1644 khuyếch đại âm thanh

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DCA 1644 Power Amplifier/ Bộ khuyếch đại âm thanh

Features: 4-Channel Power Amplifier

  • 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.


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



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



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)


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)


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)


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


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

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