guys ive done this many tims and never had this problem, conected a set of 6x9 on the shelf of my daily with a small audioline amp, sounds cristal clear and way loud enough for me problem is as soon as i start the car the speakers buzz off there head, i tried 2 difrent amps 1 x audioline and 1 x cadence so its not the amp, i made sure the rca and the power wire were run down difrent sides of the car, now im just running them on full mode (not low or high pass) but when i switch to low pass the buzzing disapears......could it just be the rca leads, if it was then wouldnt it do it even on low pass? its really pissing me off and its due in to vic rds tomorrow to get rego so i want it fixed tonight, its only coming through the back speakers (rears have the amp only) plzzzz helpppp

try changing the rca's leads and run a separate remote wire

yeah ive got the remote wire running along with the power wire, as for the rca, ill have to wait i dont have any more

I used to have a similar problem and it turned out to be a dodgy earth wire

man i just moved it and still the same ****

If you can't hear the buzzing in low pass mode, it probably just means that the frequency of the buzzing is higher than the low pass crossover frequency. For example, if the buzzing is at 500hz and your low pass is at 80hz, the buzzing will be filtered out. As for the problem itself, I dunno. Possibly poor shielding on the RCA lead, and/or your RCA lead is too close to the car's wiring loom. I don't know what else to check.

i changed rca's and it didnt chance at all, the cars wiring harness is on the oposite side which is where i put the power wire

Is the head unit and amp both grounded to a scraped bare metal part of the car with proper star earthing washers? May not be your problem but i have found often some earth's can look as if they're nicely contacting but they actually don't work all that well.

ok guys i found the problem........the head unit was ****ed, changed it and all is well, thanks for your help guys

sorry to bump up a olldish thread but i had the same problem and yes i found it was my head unit the rca outputs wer shtting them selfs

Yeop same here. It happened twice for me and my mates deck is doing the same, and they're all Pioneer.

Mines doing that now and its a pioneer....should i change rca's?

I had the same problem. Had the power and rca's running down different sides and the gain down the middle. After doing that the problem was still there. So the easiest way I fixed the problem was to buy a noise filter. It just connects to the rca's near the head unit.(so easy). You can buy a noise filter from any car audio place. Or a website. http://www.bizrate.com/caraccessorie...se+filter.html (http://www.bizrate.com/caraccessories/products__keyword--rca+noise+filter.html)