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QD-4240

Professional Quad Amplifier

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Product Features

■ Four Channel Amplifier
    Four channels in a single chassis.
■ Advanced Protection Circuitry
    Thermal overload protection, DC detection circuitry and power-on delay help protect your amplifier and system components.
■ Bridged Mono Operation
    Can operate in monaural mode for high-power and performance.
■ Slim Design, Compact Size
    Streamlined design fits in a compact 2RU space.
■ Integrated Crossover
    The QX-4960 features a built-in crossover for easy and convenient system integration.

Product specification

  QD-4240QD-4480QD-4960QX-4960
Rated Output (RMS)
f=1kHz, THD+N≤0.1% (Typical)		QUADRL=8Ω40W80W170W
RL=4Ω60W120W240W
BRIDGED STEREO RL=8Ω120W240W480W
One Channel Driven 
f=1KHz THD+N≤0.1%   		 RL=4Ω60W120W240W
Frequency Response RL=8Ω, P=1W 20Hz~20kHz (±0.5dB)
Power Bandwidth Half Power, THD+N≤0.1%QUADRL=8Ω10Hz~70kHz10Hz~20kHz
Total Harmonic Distortion (THD+N) 
f=20Hz~20kHz, Half Power		QUADRL=8Ω≤ 0.1%
BRIDGEDRL=8Ω≤ 0.1%
Channel Separation Half Power RL=8Ω,
f=1kHz, ATT. max. Input 600Ω shunt		 ≥ 80dB
Residual Noise (DIN Audio Filter) ≤ –75dB: ATT min.≤ –85dB: ATT min.
Signal-to-Noise Ratio DIN Audio, Input 600Ω Shunt ≥-95dB
Sensitivity (ATT max.)
Rated Power into 4Ω 1kHz		 0dB
Input Impedance (ATT max.) ≥ 20kΩ (Balance/Unbalance)
IndicatorsPower (Red)(Red)
Protection (Mute) x 4(Red)(Red)
Clip x 4(Red)(Orange)
Signal x 4(Green)(Green)
Protection Power SW ON/OFF muting
Heatsink Temp ≥ 100˚C (212˚F)
PC Limiter 
Fan Circuit –50˚C (122˚F)–60˚C (140˚F)–
Low-Speed – Variable – Hi-Speed
Controls (Front) Power SW: Push up On/Push down Of
Attenuator: 21-position dB calibrated
(Rear) Mode SW: Bridge=BTL/Stereo/Parallel
Power Source 100-120VAC or 220-240VAC; 50/60Hz
(Supplied AC mains transformer depends on country requirements) 
Power Consumption 300W420W770W
Weight 11.5kg/25.3lb15.5kg/34.2lb17kg/37.5lb
Dimensions 482(W) x 88(H) x 369(D) mm/19(W) x 3.5(H) x 14.5(D) in
Connectors Input : Combination Jack (balance)
Output : 5-Way binding posts x 4
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