Buzzing noise

[rayray086]

So I recently fitted an amp and aftermarket headunit to my sister's Polo. It works very well and sounds much better than the stock setup. However, whenever she drives the car, there's a buzzing sound and it seems to go in-sync with the revs, i.e. the higher the car revs, the more audible the buzzing sound becomes. Also, starting the car with the headunit on also gives a bit of trouble, as if the car is slightly struggling. However, there are no cut-outs or any other trouble.

I used a standard wiring kit to hook up the amp. I'm not quite sure but the power/ground cables provided were either 4ga or 8ga. Ground cable for the amp is about 40cm long. The headunit was adapted to the stock harness so I'm using the same wires that powered the old headunit. Same with the ground.

I think my problem is that the stock positive cables going from the battery to the starter/alternator are not rated high/thick enough. I didn't have this problem with my car as I upgraded all cables to 2ga/4ga when I did my installation. What do you guys think?

[RhysQ]

the buzzing noise generally means the power is not grounding properly so you'll have to check the wiring again. with old cars, using the stock thin wiring means it will not ground properly so you will have to go a lower power and earth gauge FROM THE BATTERY... 8ga should be ok.

[KI11Z]

i had this quite some time ago and was basicly told that your amp has a dodgey grounding point, just try changing your earth cables location; Failing that, I believe you can buy little in-line noise filters thatd eliminate the static . . . hope it helps

[Jondarren]

Your stock wiring is causing the problem i think. If you wire in the head unit independently of the stock harness this should help.

Its likely the grounding so run a stand alone earth cable and power from the battery for best results. Or earth from the chassis somewhere.

Much better to go direct than to add in some noise filter to the mix.

Cheers

Jon

[The_Hawk]

Is it a Pioneer head unit by any chance?

Pioneer units have a habit of blowing the track fuse on the RCA lines which cause the same problem. (you will prob also get noise when you turn on the AC/heater fan)

[Soundofav6]

that would be the altenator noise, try to turn the Gain down in the amp.
If not try this http://www.mobileelectronics.com.au/...howtopic=42644

[rayray086]

Not a Pioneer, a Clarion. The same headunit was used in my car and had no problems.

In regards to running a ground cable from the headunit directly to the battery - I keep hearing that ground cables should be short. Would this be a problem? I'll also check the grounding point for the amp.

Thanks for the link to Louis, will try that if all else fails.