Weird High Pitch Whistle Coming Through Speakers

[rseifert 10+ year member]

Hey guys, I recently installed an amplifier in my pick-up truck to power 4 speakers. The truck had just 2 speakers in it at first then I added 2 more and the amp to power all 4. Anyway, all was fine for a few weeks after the install, however Just the other day I noticed a really high/fine pitched noise coming from the rear speakers. It is almost like the sound that a dog whistle would make. I have sensitive hearing. My girlfriend can't even hear it. But I know for a fact it wasn't there at first. I havn't changed or touched anything. The sound is not consistent. It comes and goes and I can't pin point any causes for it. What could it be? Thanks for any input.

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[Horsemanwill 10+ year member]

check all ur wires

 

[rseifert 10+ year member]

what do you mean by check them? Like connections to the amp and stuff?

 

[TurdFergueson2 5,000+ posts]

Which HU? Pioneer?

 

[tigerf117 10+ year member]

DOes it get louder or softer in different circumstances? like if you press on the gass it gets higher pitched etc

 

[djman37 5,000+ posts]

does the pitch go up and down with RPMs? does it get worse with more electrical strain(lights, heater, etc.)

 

[rseifert 10+ year member]

I have a Sony xplod HU and I should have included this info at first, but no....the pitch of the whistle does not change at all with the rpms or anything. It is very high pitch, almost sounds like the noise you hear when a loud noise makes your ears ring. hahaha and no, it's not my ears ringing. And like I said, the noise is intermittent. weird