Terrible buzzing coming from rear speakers.. video

[SourDeez 10+ year member]

So today I hooked my 4 channel amp back up..

When I had taken it out, everything was working fine, but I decided with the small amount of power I had I kept it all for my sub amp and left my speakers running off head unit.

Anyways, I installed it and get this terrible buzzing/humming coming from the speakers.

Obviously first thing I think is the RCA's.. I have 3 pairs run in my car, tried all 3, and changed nothing (tried all 3 with my sub amp as well and they all worked)

So I can rule out the RCA's..

Speakers themselves are fine when run off headunit sound just fine..

Any ideas?

I was thinking possibly the RCA output on my headunit for the rear/front outputs could be bad? Only way to test that is swap headunits which I'm gonna try later.

http://www.youtube.com/watch?v=LgCUUylkM6U

Click to read more...

 

[05fronty 5,000+ posts]

check you ground again

 

[Bumpin' Goalie 10+ year member]

Check your ground and your H/u's internal ground.

 

[SourDeez 10+ year member]

Checked and changed grounds.. all good.. no change

 

[Imtjnotu 5,000+ posts]

sounds like terrible interference....

u said its only coming from the rear? could those channels on the amp be bad? try hooking up the front speakers to those channels and see if u get the same results

 

[05trailblazer 10+ year member]

first off what kind of amp is it? and you said it was working good when first installed right? next question waas the car on or off when working fine??

 

[SourDeez 10+ year member]

sounds like terrible interference....
u said its only coming from the rear? could those channels on the amp be bad? try hooking up the front speakers to those channels and see if u get the same results

The only reason I did that, was because it takes 30 seconds to wire my rear speakers to amp and abot 10 min to do my fronts. I tried the fronts about ten mins ago, front channels and wired speakers and it did the same thing

first off what kind of amp is it? and you said it was working good when first installed right? next question waas the car on or off when working fine??

It's a rockford fosgate prime 300.4

Rockford Fosgate® - R300-4

The amp has gotta be fine. I bough it from sonic about a month ago, tested it out when I didn't have my sub figured out yet and used it for awhile and worked fine. When I put my sub in I took out the 4 channel amp until now.

 

[Imtjnotu 5,000+ posts]

im thinkin something is up with the amp

 

[SourDeez 10+ year member]

im thinkin something is up with the amp

I'm thinkin too. Gonna try a headunit swap. Thinking it's possibly the outputs cause I had to push pretty hard to get the RCAs out earlier.

If not then it's gotta be the amp

 

[QuietEclipse29 10+ year member]

I had the same prob and it was cuz all my RCA cords were ran right next to my power and ground runs. I moved them to the other side and it was gone. Maybe I just got lucky tho. Good luck

 

[05trailblazer 10+ year member]

^^ i have the same problem too but it was my amp at the end