Question about Pioneer Audio Players & Recorders

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My Pioneer M90 power amp started making very loud thumping noises when it was switched on, tried all inputs with was the same result. Failure of which component could caquse that?

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Change filter cap

Posted on Aug 03, 2008

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Posted on Jan 02, 2017

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S8 makes a very loud vibrating buzzing noise with only the power lead plugged in


Check for ground loops. Also shut off any CFL or LED lamps inthe vicinity.

You may also have an intermittent connection on the input.

There is a lesser chance that there is an internal failure of a capacitor on the amp power supply, but it is a possibility to look at if all the wiring is in place and soundly connected. The S8 has a high gain amp. It will pick up interference from CCFL or LED ballasting supplies it will also be able to pick up other switch mode power supplies. in vicinity of the input cable.

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Bass speaker start up noise


Hello anne845,

It sounds like the installer wired the amp remote turn-on terminal to an "accessory" lead in your vehicle. Many stock radios do not have a dedicated amp turn-or lead and the alternative is to connect the amp to a switched power source (ignition or accessory). This means the amp turns on whenever you turn on the vehicle ignition, often resulting in a thumping from the subs. It is a perfectly satisfactory alternative, and will not damage either the amp or the sub. But it's irritating.

If the thumping is objectionable, have your installer wire a SPST (Single Pole, Single Throw) toggle switch inline with the turn-on wire. The switch should be mounted so it is accessible by the driver, and whenever you turn on the radio, turn on the toggle switch.

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1 Answer

Audio noise while car is on no prob in past


I've had that same problem before. What was happening is one of my amps safety cut off usually a built in surge protector basically, was coming on thus the loud thump. Most of the time when it comes on the amp goes off. Could be a power issue as well. Have your alternator checked too. Once your car is started it is run by your altenator so it could not being supply enough power. I fixed my problem by adding two 1 fared capacitor, one for each amp I was running.

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1 Answer

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Hi Jamesroy,

Remove the Audio inputs from the bass box to see if the thump is coming from the Audio input. Of course do this with everything turned on. What we are trying to figure out is where the thump is originating from. If the bass box does not thump when the audio inputs are disconnected, the thump is coming from somehwere between the bass box and the circuits inside the head unit.
If you still have the thump after the Audio input wires are disconnected, then your bass box's amplifier has noise problem. You might try getting a noise filter from best buy to put on the power supply feeding the bass box.

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1 Answer

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since it still thumps i suspect the speaker is ok, but i suspect you have an electronic problem in the amp. since it is a powered sup & has the ability to auto turn on it has electronic circuits inside, take it to a service center for an estimate

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