weird noise

[mattdx88]

ok after i gt my car out of the shop its been making this weird noise through the speakers it is like a whistle and its not my amp, it all comes from all my speakers it gets higher in pitch as the engine revs

[Mac]

It could be noise from the alternator.

[Ludi Mali]

Its definately noise from the alternator, You have your power wire running next to your rca's/signal wires. The current causes noise in the signal. Mine does that, but i'm too lazy to fix it, plus you can't hear it when you turn up the volume.