buzzing: Arrggh!

[kingsxman 10+ year member]

Here's the scoop: paid for a pro install to have a 4 channel amp installed along with adding an older alpine 3331 eq/crossover to the system. Alpine 3331 is installed up with my head unit so all 3 sets of rca's are running from up front back to amps. After install there is a bad buzz in system (both front and back speakers). Installer said its my 4 channel amp..which WAS a refurb from Profile. I did a bit of troubleshooting myself and figure its either alpine eq or the amp. Problem doesnt follow any specific rca and seems to be coming from both front and rear speakers (i.e. all over).

Got replacment amp from profile: same thing.

Before I go and order a replacment 3331 eq/crossover off ebay...can it be anything else? I never had the noise with my head unit and a sub amp (running sub output from head unit to amp). Could it be a ground on the 4 channel amp? (appears to be good..but you never know).

I can take it back to shop that did the install and say "fix it"...but I'm guessing they'll come back and say its the EQ. How much can I make them troubleshoot this issue? THey were wrong once already on what issue was.

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[johnecon2001 5,000+ posts]

could be a bad ground for the amp or the head unit. Make sure both places have been secured on clean metal.

 

[kingsxman 10+ year member]

If its a ground..its gotta be at the head unit. I did a little more testing tonight. Its a weird one:

I ONLY get buzzing with all 4 rca inputs plugged in. I can unplug either set of inputs....and buzzing goes away. To me...if it were a grounding issue on the amp the buzz should never go away.

I unplugged the rear input rca's and will run with just fronts for the time being. Still debating on whether or not to take it back to pro install place and have them check it out.

 

[jujumantb 10+ year member]

so the rca's go from deck---EQ----Amps?

Then just bypass the EQ one time and see if it goes away, if it does, then its something with the EQ, ground or faulty.

 

[kingsxman 10+ year member]

Good idea. Thats what I'll have to do. One of the reaons I've got the eq in there is that my deck only has a front and sub out. Not front, rear and sub. The eq has all these. The deck never made any noise before.....so I really think its the eq.

I'll try and do this tonight.

 

[babyboyjames]

hey i had the same problem with the ground noise....if u find a solution 2 it could u pleaz tell me.....thank you