Hi Guys,

 

I've just purchased a new set of 6x9's for the pug which I want to amp up.

 

The problem is I want to use the factory system and set up, so I had to go with a high level input into the amp on the left and right channels from the rear speakers.

 

After wiring the amp in and doing some tuning it sounded great, but I've got the dreaded engine noise / interference somewhere in the set up.

 

My first thought was because I was using high-level as an input, but there is no noise to the speakers if I plug the wires on direct, so there can't be noise going into the amp. My second thought was the ground to the amp and the ground to the high level input, so I split them up, I'd already tried putting them together, and I tried several different grounding locations but nothing made a difference.

 

My next thought was the live, but I was using 17amp (although amp should have 20amp), and it was only running the 6x9's at a very low level (amp was barely on) so I'm not sure if it was dragging anything in through that.

 

Any ideas?

 

I got so pissed off I just stripped it all back out, I don't want to drive around sounding like I have a swarm of angry bee's in the back.

 

 

Cheers!

Interference from something in the RCA leads ?

That's the thing though, I've had to use high level instead of RCA's as it's a factory unit. I thought that might be causing the interference, but if I connect those lines to speakers they are perfect with no noise, so it must be picking it up on the amp somewhere.

could still be earthing problem... what gauge are your power and earth cables and how long is the cable from your amp to earth? have you tried a ground loop isolator?