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Table of Contents
Related Manuals for Inter-m QD-4240
Summary of Contents for Inter-m QD-4240
- Page 1 OPERATING MANUAL AMPLIFIER QD-4240/4480...
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Page 2: Unpacking And Installation
UNPACKING AND INSTALLATION Although it is neither complicated to install nor difficult to operate your power Amplifier, a few minutes of your time is required to read this manual for a properly wired installation and becoming familiar with its many features and how to use them. - Page 3 FEATURES • 4 CHANNEL AMPLIFIER These quad amplifier has 4CH Amplifier circuit in the one unit. • SUBSTANTIAL PROTECTION CIRCUITARY To insure stability and reliability against over current and overheating extra protection circuitary is provided. In addition, turn on delay and DC detection circuitary is provided to protect the loud-speaker. •...
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Page 4: Front Panel Controls
CHANNEL2 1. POWER SWITCH AND INDICATOR Lights whenever the QD-4240/4480 is powered on use this to power the QD-4240/4480 on or off. 2. PROTECTION INDICATOR This red LED indicator lights up for approximately six seconds when the amplifier is powered ON, indicating that the soft-start protection system is working. -
Page 5: Rear Panel Controls
REAR PANEL CONTROLS INPUT OUTPUT OUTPUT INPUT CH 1 CH 1 CH 3 CH 2 CH 4 PUSH PUSH PUSH PUSH MODEL NO : QD-4480 CH 3(4Ω ~8Ω ) CH 1(4Ω ~8Ω ) QUAD AMPLIFIER OUTPUT POWER : STEREO:120W(4Ω)X4 : BRIDGED:240W(8Ω)X2 BRIDGED MONO USE CHANNEL 2, 4 CONTROL IS "O"... - Page 6 4. AC POWER Plug this AC input cord into AC outlet. FANS (QD-4240/4480) The fans should be kept free of all obstructions and be accessible to cool fresh air when possible. It is important that the fans be used in a dust free environment.
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Page 7: Speaker Impedance
SPEAKER IMPEDANCE QD-4240/QD-4480 series amplifier has three operating modes: Stereo, Bridged and Parallel and allows you to connect multiple speaker systems in parallel. Therefore, the minimum speaker impedance various depending on the combination of these speakers. Be sure that the speaker impedance falls below the specified impedance. -
Page 8: Caution For Speaker Connection
The output capacity of this amplifier is high: 120W 4CH (4Ω) in stereo and 240W 2CH (8Ω) in monaural on the QD-4480: 60W 4CH (4Ω) in stereo and 120W 2CH (8Ω) in monaural on the QD-4240. Besure to use a speaker system that has sufficient input capacity. -
Page 9: Portable Rack Mounting
Use the following formula to determine the fuse capacity according to the speaker’s input capacity. Po = I P0 [W] : Speaker’s continuous input capacity (noise or RMS) R [Ω] : Speaker’s nominal impedance I [A] : Required fuse capacity ex.) Speaker’s continuous input capacity: 100W Speaker’s impedance: 8Ω... -
Page 10: Positioning The Housed Amplifier
POSITIONING THE HOUSED AMPLIFIER Place the case so that the ventilation airflow paths are not blocked. Front Less than 10 cm Front TROUBLESHOOTING The following table lists the main causes of abnormal operation and the corrective measures required, as well as the protective circuit operation in each case. - Page 11 1 1 0 0 CONNECTIONS SINGLE AMP SYSTEM...
- Page 12 1 1 1 1 CONNECTIONS BRIDGED MONO OPERATION 1. Set mode selector to bridged mono. 2. Set the Channel 2 and 4 VR to maximum (0) position. 3. Connect a mono input signal to channel one input jack. 4. Connect the speaker load to the two red terminals of each channel, please confirm the (+) terminal of speaker to channel one and the (–) terminal to channel two.
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Page 13: Specifications
1 1 2 2 SPECIFICATIONS QD-4240 QD-4480 Power Output Level f=1KHz, THD+N≤0.05% (Typical) QUAD RL=8Ω 120W RL=4Ω 120W 240W BRIDGED STEREO RL=8Ω One Channel Driven f=1KHz THD+N≤0.05% RL=4Ω 120W Frequency Response RL=8Ω, P.=1W 0dB+0.5, –1.5dB: f=DC~55KHz Power Bandwidth Half Power, THD+N≤0.1% 10Hz~70KHz STEREO RL=8Ω... - Page 14 MADE IN KOREA...
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