Hi guys, I need some help from anyone who has a clue about speakers/audio. I am pretty good mechanically but this electronics thing is not my forte. Here’s the deal. When we first got the Z my hubby took her up to circut city ( I know I know wrong move by it was his deal) and had them replace the stock speakers w/ alpines and added an alpine amp (all speakers except the sub). Last summer I started noticing “fuzz” coming from the woofer right behind my head in the drivers seat. Wierd thing is that it comes and goes, like if I hit a bump in the road, or corner really hard at high speeds. Now to me, that seems like there is something wrong w/ a wire connection as opposed to a blown speaker. We took it back to circut city and they supposedly found a wire that was grounded or something. Said it was fixed but now since getting the Z back on the road after the winter, I am still having the same problem.
My question is this: Is there a test that an audio place could do in order to tell where the actual problem is, or do I have to subject my Z to having all the interior panels ripped off in order to find the culprit? There is a place down greensburg pike from me like 3 blocks that is an audio place if anyone is familiar? I think I might take her there but if someone has any good/bad reports about this place I’d be very grateful. Thanks to anyone who can give me any advice. cheers.
sounds like a loose ground.
can also be called something called a ground loop. can be picked up anywhere. They sell ground loop isolators that may help.
in some cases it can also be a sign of a failing alternator.
also check to see if they ran your power wire and signal wire together. that can cause you to have the fuzzy sound thru your speakers as well
Thanks guys, I appreciate the input. 
Id say check all the spliced and connected wires, maybe if you can get your hands on a different sub to try out and cancel the sub being f-ed up from the equation. Bascialyl your best bet is to try all senerios can cancel out all the major things like, sub going dead, faulty wire connection, check all the grounds and i dunno about the Z but on my 200sx my antenna was loose and when you moved it around id get feedback in my sub and if you shook it hard enough the headunit actually turned itself off and it would come back on…prob not the issue here, but something to look into if all else fails
cuz your head unit shared ground with your antennea. its not as common as it used to be. depending on car you antennea, radio, fuel pump can all share a common ground
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how about just have it done / fixed right instead of slapping half assed band-aids on it…