High pitch noise at certain throttle positions

[kcriqui]

Originally Posted by ike84

In my experience, better rca cables will not fix it most of these. There are two types, problems with rca cables and problem with the power source, but the power source is very common and not easily fixed. It has to do with electromagnetic interference, often times generated by the alternator (notice that it gets higher pitched with higher rpm). Good amps have filters built in to address this problem. It's one reason why cheap amps are cheap.

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The crazy thing is, this isn't alternator noise. It happens when the ignition is on, but the engine not running. Pressing the accelerator changes the volume of the noise, not the pitch. It sounds like a dirty pot, kind of scratchy as I move the pedal and different throttle positions result in the noise getting louder or completely silent.

[kcriqui]

Originally Posted by kcriqui

The crazy thing is, this isn't alternator noise. It happens when the ignition is on, but the engine not running. Pressing the accelerator changes the volume of the noise, not the pitch. It sounds like a dirty pot, kind of scratchy as I move the pedal and different throttle positions result in the noise getting louder or completely silent.

I tried a few more things and ultimately (and not surprisingly) connecting the ground lead for the amp directly to the battery reduced the noise by 90%, which is tolerable. I had been using the original power and ground leads from the OEM amp.

[ike84]

Originally Posted by kcriqui

I tried a few more things and ultimately (and not surprisingly) connecting the ground lead for the amp directly to the battery reduced the noise by 90%, which is tolerable. I had been using the original power and ground leads from the OEM amp.

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