High pitch sound in my music.......Y?

[fire919 10+ year member]

ok so i've got 2 6x9's hooked up to a 2 channel amp. when the car is off its plays good....but the minute i start up the car i get a high pitch noise

that completely drowns on the music...and th only way to hear it iz to crank the volume wayyyyyyyy up........y is this happening.

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[twistedchild420 5,000+ posts]

grounding issues?

 

[fire919 10+ year member]

will try that could be the problem for real nvr thought about that , thx bro........96' Mustang on 19's i love those cars ......."(i keep em clean though).....lol" next friday right

 

[fire919 10+ year member]

Grounded Properly fo sure but still didn't work....and still getting that noise...

 

[SlipTap 10+ year member]

Sounds like alternator noise. Does the pitch change with the RPM speed of the engine (i.e. get higher pitched as the engine revs increase?) If so, it's "alternator noise." Make sure grounds are good (sanded paint = ground wire hits bare metal, good solid ground, ground wire is thicker than power wire) and check that for your alternator too, to make sure it is properly grounded.