Re: whi is my amp making this sound????
That's the dreaded alt whine.
Check ground wire (make sure it's the same size as the power wire, if not larger and check that the contact point is solid)
Also, the speaker/signal wires might be picking up the sound. Try rerouting the wires to another side. (power wire and window motor both emit noise)
Do you have performance sparkplug cables? replce to the original.
Sony C90, 210 EQ
Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
RF 60.2 amp
Soundstream picasso 1400.1D
Bass drive-by's are uncool.