Tested to power on, output over Channel 1. Units have scuffs and scratches, may be missing front handles.

Includes QD-4480 amplifier, power cable.

The QD-4240/4480/4960 are four-channel amplifiers capable of driving 4Ω loads. Their clean sound quality makes them ideal for permanent installation in professional PA systems or for portable use for live performances. Inputs are XLR/TRS “Combo” connectors; outputs are via rugged five-way binding post connectors. Clip-limiters are supplied on each channel to help prevent distortion due to excessive signal levels. All units have soft-start protection circuitry and feature power, signal, protection, and clip indicators on the front panel. For added versatility, they may be operated in stereo, dual mono or bridged mono mode. The quad series amplifiers are powered by 100-120VAC or 220-240VAC 50/60Hz(depending on country requirements) and are packaged in 3.5” (2RU) high rack mount enclosures.

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.

(QD-4480-R)

Rated Output (RMS)
f=1kHz, THD+N≤0.1% (Typical)
QUAD RL=8Ω 80W
RL=4Ω 120W
BRIDGED STEREO  RL=8Ω 240W
One Channel Driven 
f=1KHz THD+N≤0.1%   
  RL=4Ω 120W
Frequency Response RL=8Ω, P=1W   20Hz~20kHz (±0.5dB)
Power Bandwidth Half Power, THD+N≤0.1% QUAD RL=8Ω 10Hz~70kHz
Total Harmonic Distortion (THD+N) 
f=20Hz~20kHz, Half Power
QUAD RL=8Ω ≤ 0.1%
BRIDGED RL=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.
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)
Indicators Power  (Red)
Protection (Mute) x 4 (Red)
Clip x 4 (Red)
Signal x 4 (Green)
Protection   Power SW ON/OFF muting
Heatsink Temp ≥ 100˚C (212˚F)
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   420W
Weight   15.5kg/34.2lb
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
SKU QD-4480-R
Barcode # 601527516052
Brand Inter M
Brand Inter M
Type Power Amplifier
Colour Black
Model QD-4480
Number of Channels 4
Power 4x80W @ 8Ω
Audio Inputs 4
Audio Outputs 4
Number of Inputs 4
Number of Outputs 4
Shipping Cubic 0.016317000m3

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