Whinning noise when I turn on my radio., I probably know the general answer. Options

[UTSlickVic]

Ok guy/gals,

When I turn on my head unit (CD/radio/sirius/etc) I hear some feed back whinning noise coming through the speakers. And when I change CD tracks I can hear a garbled track-change noise through the speakers (it use to be I just heard this coming from the unit itself, never though the speakers). It has never made this noise before. The last thing I did was the premium 8 speaker set up (with stock amps) and it never made that noise before.

Now for the kicker (and I maybe waaay off base but...) I THINK this noise started when I recharged my a/c freon. I remember recharging it and when I turned on my car the a/c was COOL but I noticed that whinning noise. I may have put too much.... anyways. Am I retarded or something? If not, let me know.

Anyways I'm guessing its a grounding isssue..... sigh But where do I start? I mean dang its been awhile since I messed with my system. Im really dont want to go around and check every wire.

PS: Would having mutiple grounds be causing this?

Thanks

[Salt_City_GT]

I have never heard anything about multiple grounds but if so I would think that if any of them are bad you would get that sound. If the whine gets louder as you rev your engine then the ground is bad. You need to run a ground wire to a shorter ground than any of the others and if that fixes it then you just need to fix the bad ground. I had this same problem in my old car its a nuisance but easy to fix