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Quest QA Series power amplifies are built to work hard inthe tough environment of pro audio. Industrial spec multi-speed fans and generous heat sinks will keep the output stage cool even if the amplifier is installed in a dusty and poorly ventilated area.

Service and maintenance is easy as the internal architecture is laid out for easy access by a qualified technician.

The sonically superior output stage is composed of a generous abundance of output devices for greater electronic stability and sonic fidelity.

QA series amplifiers are manufactured to a standard accepted as desirable practice for a concert standard power amplifier.

Heavy gauge welded 16-gauge steel chassis with vibration proof fittings, and an emphasis on over-engineering, guarantees years of trouble-free service in the most demanding environments.

Quest set about a design and layout for easy service, noteasy manufacture.

A minimum of disassembly is required for testing and maintenance meaning lower operating costs and longer amplifier life.


  • Input Stage:
    • Pro active protection senses stages of system function to safeguard your investment both on turn on and while under operation.
    • Silent switch on/off circuitry reduces potential speaker damage in the event of intermittent power.
  • Power supply:
    • The high current power supply is manufactured to function reliably at high temperatures and well exceeds industry standards.
    • This results in smooth bass response and considerable dynamic headroom.
  • Industrial Spec
    • Fans: Dual heavy duty cooling fans guarantee long life of all electronic components.
  • Input Connection:
    • XLR parallel male and female input connections calibrated for most pro spec system controllers and electronic cross-overs. features
  • Speakon Connections:
    • International AES standard Speakon connectors wired for two channel and Bridge mono operation simplify speaker connections.
  • Limiter:
    • A switchable high speed limiter acts as a final speaker protection but can be disconnected where sensing speaker system controllers are required.
  • Built in switchable X-overs:
    • High Amplification and low pass filters on each channel make the versatile QA series even more flexible witha sub-mid/high frequency dividing network.
  • Selectable Gain settings:
    • Adjustable input switching for 0.775V, 32 dB or 26dB make system calibration easy.
  • Easy access air filters:
    • User serviceable air filters are easy to maintain for trouble free operation.

Note The QA Series Power Amplifiers are not Bridgeable



QA1004 Stereo Power Amp

QA2004 Stereo PowerAmp



2x 575-w at 4O 2x 870-w at 4O    
  • Rated Power
    (2x 8O):
290-W per channel @ 1kHz at <0.1% T.H.D. both channels driven 490-W per channel @ 1kHz at <0.1% T.H.D. both channels driven    
  • Rated Power:
    (2x 4O):
575-W per channel@ 1kHz at <0.1%T.H.D. both channels driven 870-W per channel @ 1kHz at <0.1% T.H.D. both channels driven    
  • T.H.D:
<0.1%@250-W per channel from 20 HZ to 20kHz <0.1%@400-W
per channel from 20 HZ to 20kHz
  • Minimum Load Impedeance:
2O - Audio signal / 4O - Signal wave
  • Phase Response:
+5 to -15 from 20 Hz to20kHz  
  • Input Impedance:
20 kO, balanced; 10 kO, unbalanced
  • Cooling:
Two temperature dependant variable speed 80mm high-output DC fans  
  • Controls:
Two front panel attenuators, rear panel mode switch and gain select switch
  • High Pass:
Linkwitz-Reily (24 dB/Octave): Off/35/80 Hz
  • Low Pass:
Linkwitz-Reily (24 dB/Octave): Off/80/110Hz
  • Voltage Gain @
29 dB or 24 dB 32 dB or 26 dB    
  • Crosstalk:
>-60 dB @ 1kHz at rated power @ 8O
  • Hum and Noise:
>-105 dB, "A" weighted referenced to rated power @ 8O >-107 dB, "A" weighted referenced to rated power @ 8O
  • Slew Rate:
  • Damping factor (8O):
>500:1 @ 20Hz - 1kHz >700:1 @ 20Hz - 1kHz  
  • Indicator LEDs:
Two clip, two signal presence, one active status, two protection
  • Protection:
Thermal, DC, turn-on bursts, subsonic, incorrect loads
  • Connectors:
XLR . Speakon . 240/230Volt 16 amp IEC mains
  • Construction:
Cold Steel Rolling + Machined aluminium front panel
  • Dimensions (HxWxD):
89mm x 483mm x 496mm  
  • Net Weight:
17kg 21kg    
  • Packaged Shipping Weight:
20kg 23kg