Question about Directed 2400d Car Audio Amplifier

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Amp is getting negative feedback when stereo is paused you hear a sratchin high pitch noise

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  • chris cogburn May 11, 2010

    When the engine is on, or all the time? You are probably getting bleed-through from the electrical system. You may need to run a separate, dedicated ground wire, instead of grounding to the chassis. It's a common problem. Also, I once had an amp (cheap) that made that sound no matter what I did: if the amp is pretty cheap, the noise could be coming from the amp itself.

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1 problem that happens is you may have run your rca cables and battery cable down the same side to the amp this can cause distortion between the cables

Posted on Jul 30, 2009

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Bose QC3 makes a high pitch noise when i press it against my ear


The design of these headphones includes a microphone on the outside and on the inside of each earcup. The outside microphone detects outside noise. The inside microphone monitors what you are hearing and when it detects that the outside noise is present inside, the active noise-canceling circuits remove that noise. This happens fast enough that you perceive a siginficant reduction in the outside noise getting to your ears.

The airspace inside the earcup is a tuned chamber defined by the foam in the ear cushion. This is important because with the inside microphone in close proximity, but at a 90-degree angle to the speaker, the circuit must be designed to eliminate the normal feedback that occurs. When you press the earcup close to your ear, you are changing the size and shape of the air chamber inside of the earcup thus directing more of the speaker sound toward the microphone than the design can compensate for causing audio feedback to occur. You are hearing that feedback. Removing your hand from the earcup should restore the shape of the air chamber allowing the circuits to return to normal operation.

If the feedback occurs too easily when you are NOT pressing on the earcup, then the foam may have weakened/deteriorated and it may be time to replace the ear cushion.

On my QC-3 headphones, I can cause the feedback squeal in both earcups, with the left earcup being more sensitive to the shape change than the right.

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Need specs and wiring options


Eclipse 36401 eclipse%20pa36401.jpg
  • 105W x 4 Channel Max. Power Output at 2o.gif Stereo
  • 60W x 4 Channel 0.1% THD at 2o.gif Stereo @13.8V (RMS Continuous Power)
  • 40W x 4 Channel 0.1% THD at 4o.gif Stereo @13.8V (RMS Continuous Power)
  • ChannelFlex Crossover
  • Adjustable High-Pass Frequency (50-200Hz, L/R Independent)
  • Low-Pass Frequency (120Hz)
  • Adjustable Bass-Boost Level (45Hz, 0-9dB, F/R Separate)
  • High-Current, High-Speed Output Devices
  • High-Efficiency, High-Energy MOS-FET Power Supply
  • Audiophile Grade Component Selection
  • Intelligent 7-Way Discrete Protection Circuitry
  • Noise Reduction with Low Distortion & Ultra-Low Negative Feedback
  • High-Level Input - Add on Capability
  • Epoxy Composite PCB
  • 2o.gif Stable Design
Each 6 1/2" speaker will see 40 Watts
Each 6"x9" will see 521/2 Watts

Yes your solution is correct. Front wired in stereo, bridge rear.

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Your picking up electronic engine noise. Is this an older car or new car? If it's an older car it may just need servicing. Due you have electronic fuel injection? When was the last time your plug wires or your rotor and cap been replaced?

Here is a simple test when it's pitch dark out. Open your hood and start up the engine. Look for electrical sparks or blue colored electrical current near and around any spark plug wires.

Do not touch the wires or it will knock you on your ***!

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have your built-in amp checked for trouble. there should be trouble in the output stage feedback loop. this is something to be done by a repair technician

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