QA Series Amplifiers

Quest QA Series power amplifies are built to work hard in the 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, not easy manufacture. A minimum of disassembly is required for testing and maintenance meaning lower operating costs and longer amplifier life.

QA 3004 Amplifier front and back panels

  • 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 with a sub-mid/high frequency dividing network.
  • Selectable Gain settings: Adjustable input switching for 0.775V, 32 dB or 26 dB make system calibration easy.
  • Easy access air filters: User serviceable air filters are easy to maintain for trouble free operation.



QA1004 Stereo Power Amp

QA2004 Stereo Power Amp

QA3004 Stereo Power Amp

QA4004 Stereo Power Amp

  2x 575-w at 4Ω 2x 870-w at 4Ω 2x 1100-w at 4Ω 2x 1700-w at 4Ω
Rated Power
(2x 8Ω):
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 660-W per channel @ 1kHz at <0.05% T.H.D. both channels driven 993-W per channel @ 1kHz at <0.05% T.H.D. both channels driven
Rated Power:
(2x 4Ω):
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 1100-W per channel @ 1kHz at <0.05% T.H.D. both channels driven 2400-W per channel @ 1kHz at <0.05% 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
<0.5%@400-W per channel from 20 HZ to 20kHz
Minimum Load Impedeance: 2Ω - Audio signal / 4Ω - Signal wave
Phase Response: +5 to -15 from 20 Hz to 20kHz +20 to -25  from 20 Hz to 20kHz
Input Impedance: 20 kΩ, balanced; 10 kΩ, unbalanced
Cooling: Two temperature dependant variable speed 80mm high-output DC fans Two temperature dependant variable speed 120mm 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 35 dB or 29 dB 38 dB or 32 dB
Crosstalk: >-60 dB @ 1kHz at rated power @ 8Ω
Hum and Noise: >-105 dB, "A" weighted referenced to rated power @ 8Ω >-107 dB, "A" weighted referenced to rated power @ 8Ω
Slew Rate: >30V/us >40V/us >44V/us
Damping factor (8Ω): >500:1 @ 20Hz - 1kHz >700:1 @ 20Hz - 1kHz >800:1 @ 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 . 240/230 Volt 16 amp IEC mains
Construction: Cold Steel Rolling + Machined aluminium front panel
Dimensions (HxWxD): 89mm x 483mm x 496mm 132 mm x 483mm x 496mm
Net Weight: 17kg 21kg 23kg 35kg
Packaged Shipping Weight: 20kg 23kg 26kg 38kg

© 2018 Group Technologies Australasia Pty Ltd ACN 072 549 010 | Privacy | Terms of Trade