ok, right at this moment i have absolutely no idea what to to to get rid of engine interference through my amped speakers. i have cleaned up both the head unit and amp grounds to the metal and have them firmly attached. as well as this i have my RCA's running OUTSIDE the car, well away from any other cables. yet still i get engine interference. any opinions and help would be very appreciated.
thanks
pete

I have seen boxes you can by from Autobarn that clear out the distortion/interference and fix this issue. I had one in my old car an it did wonders.

try running a thicker cable for your grounds.

Get a Ferrite noise suppression sleeves and attached it on your power cable. That should fix it.
Similar to this:http://img.shopping.com/cctool/PrdImg/images/pr/177X150/00/02/22/a9/2c/35825964.JPG

I think jaycar is selling this.

where do those sleeves go on the cables, the whole length?

where do those sleeves go on the cables, the whole length?
2 of this on the power cable should do it. You can put on speaker wires also just to make sure.
Check this out, I just don't know which size.
http://www.jaycar.com.au/productView.asp?ID=LF1260&CATID=&keywords=noise+suppressor&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

thanks, i'll have to look at that tomorrow, up till now i thought it would have been interference on the rca cables. now i have to go put my car back together before work.:mad: