Quest Audio QX-280 Series

The Quest Audio QX-280 Series of amplifiers is available in a wide range of single and multichannel configurations for A/V installations and high-end commercial sound applications.

With class-D amplifier topology, QX-280 Series amplifiers can be integrated into both low-impedance, and 70/100V line installations without compromise The range comprises three 280W/channel models, available as single (QX-1280), two channel (QX-2280) and four channel (QX-4280) variants.

The transformerless outputs deliver full range audio to all impedance loads from 4Ω to 70/100V systems. Each amplifier channel has a selectable 80Hz high-pass filter (selectable via a switch located on the rear panel), and a volume control for each channel that can be accessed directly from the front panel. Each amplifier channel is also provided with a thermally controlled cooling fan.

QX-280 Series amplifiers function across the power range at an 89.5% efficiency rate, with a sleep mode mains current draw of less than 0.5W per amplifier channel. The automatic standby functionality mutes an individual amplifier channel after no signal has been detected for 10mins or more; and will put the amplifier into sleep a mode after 30mins. Automatic standby can be turned on and off for individual channels via a switch on the rear panel.

The operational voltage range of the QX-280 Series covers from 85-265V AC. No manual switching is required for high and low impedance operation.

Key features:

  • · High-efficiency class-D operation.
  • · 70/100V or low-impedance operation.
  • · Auto-sleep function.
  • · Selectable 80Hz high-pass filter.
  • · Built-in limiter circuit.
  • · Thermally-controlled fans.
  • · AC power range 85-265VAC 50/60Hz.
  • · ErP (1275/2008/EC) compliant standby consumption <0.5W (per channel)
  • · Available in 1/2/4-channel models.


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