My girlfriend just picked up a 90 DX 4Dr for $650 CDN and it's got a crappy aftermarket cassette deck in it...but until she saves the money to get a decent head unit she has to make due...the odd thing that I can't figure out is when she accelerates she is getting a weird whistle from the speakers...the more she speeds up...the louder it gets, then levels off. It is also effected by the level of the sound...meaning, it does it worse at some volumes than at others.
Is there something I can do to remedy this until she get the better head unit installed? What do I look for? and how do I fix it?
(I know this is probably something very basic...but I am still learning the "electrical" world of automotive)

Thanks,

Jason :cheers:

 

The whining noise means that the head unit isn't grounded very well. Try attaching the ground(black wire) to something metal that is touching the chassis of the car. If the problem still persists, the head unit is probably defective.

 

W3rd. Try to get a strong ground. Problem is, your wires are picking up engine noise electrically, and that's why you can hear it through the speakers.

 

if it's running off an amp, then the power cable might be too close to the rca's which would cause noise interference. could be a possibility.