Overview

The QD-4240 is a quad, four channel power amplifier 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. 


Primarily designed for multi-zone use such as in bars and restaurants, where separate control of the music in several 

areas is required, these designs may be applicable for use in any situation where a number of low-power amplifiers are

required, such as for cue-feeds, effects-loudspeakers, museum displays etc. 


Three models are available; each combines four separate low-impedance amplifiers in a single 2U rack-mounted case. 

Each amplifier has an individual input XLR/TRS "Combo" balanced input connector, a level-control with associated 

signal-present and clip LED’s, and 5 way binding-post speaker output terminals. For added versatility, an input-selector

switch allows each pair of amplifiers to be driven either separately (stereo), with inputs in parallel (dual mono), or bridged

into mono. 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. 

These amplifiers are fan-cooled with circuit-protection and turn-on delay. The quad series amplifiers are powered by 

100-120VAC or 220-240VAC 50/60Hz (depending on country requirements).

Feature

- 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.

Specification

MODEL QD-4240 QD-4480 QD-4960 QX4960
Rated Output (RMS) f=1kHz, THD+N≤0.05% (Typical)
QUAD RL=8Ω 40W 80W 170W
RL=4Ω 60W 120W 240W
BRIDGED STEREO RL=8Ω 120W 240W 480W
One Channel Driven
f=1KHz THD+N≤0.05% RL=4Ω 60W 120W 240W
Frequency Response RL=8Ω, P=1W 20Hz~50kHz (±0.5dB)
Power Bandwidth Half Power, THD+N≤0.1% QUAD RL=8Ω 10Hz~70kHz 10Hz~20kHz
Total Harmonic Distortion (THD+N)
f=20Hz~20kHz, Half Power
QUAD RL=8Ω ≤ 0.05%
RL=4Ω ≤ 0.07%
BRIDGED RL=8Ω ≤ 0.07%
Channel Separation Half Power RL=8Ω, f=1kHz, ATT. max. Input 600Ω shunt ≥ 80dB
Residual Noise (DIN Audio Filter) ≤ –70dB: ATT min. ≤ –85dB: ATT min.
Signal-to-Noise Ratio DIN Audio, Input 600Ω Shunt ≥100dB
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)
Power  (Red)
Protection (Mute) x 4 (Red)
Clip x 4 (Orange)
Signal x 4 (Green)
Protection Power SW ON/OFF muting
Heatsink Temp ≥ 100˚C (212˚F)
PC Limiter RL≺2Ω RL=2Ω
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 AC 100–240V, 50/60Hz
(Supplied AC mains transformer depends on country requirements)
Power Consumption (1/8 Power) 300W 420W 770W
Weight 11.5kg/25.3lb 15.5kg/34.2lb 17kg/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
17-09-20

Contact Us

If you have questions,
please contact us via E-mail.

E-mail : overseas@inter-m.com

CONTACTS

Inter-M International (Korea HQ)

TEL: (82) 2 2289 8145

FAX: (82) 2 2289 8149

Email: overseas@inter-m.com

Inter-M Americas (USA, Canada and Latin America)

TEL: (714) 828 2200

FAX: (714) 828 2210

Email: info@inter-m.net