Engine noise problem, could you help?

[Xarpolis]

There is no PG material inside of this car.

I recently purchased an '07 Audi A4 2.0T. I love this car! Way better than the old piece of crap Accord that I had for the past 10 years. Anywho, I put a radio in it.

Nothing spectacular really. Just a Pioneer AVH-P3200BT head unit and a Pioneer GEX-P920XM.

I used a metra wiring harness and stole my accessory wire from the fuse box, rather than purchasing the $100 PAC-Audio setup.


Here are my dumb questions. I've noticed that the rear door tweeters don't work at all with this new system. I'm not really sure why, but they just sit around and hiss at me, with occasional engine noise when the headlights are turned on. It's strange. Some days there's lots of noise, other days there isn't any and the hiss goes away entirely.

Any idea what might cause this, and what I could do to fix it?

[stipud]

Does your car have a stock amp? There is a similar issue with my Saab as well... The Metra wiring harness tells you to connect speaker wires to the front/rear left/right +/- connectors, but what it is really expecting is a pre-out level (RCA). The symptoms of this were having a lot of hiss, and having the volume dial being extremely sensitive. To fix it, all you had to do was lop off some RCA ends and solder them onto the Metra harness, then hook them into your RCA outs instead of the speaker wires.

Does this sound at all familiar?

[Xarpolis]

Here's my issue. The car DOES have built in amps (It's a Bose system), but it isn't every speaker with this problem.

It's only the 2 tweeters that are located in the rear doors.

The rest of the car sounds fine. I'm not sure what singled out the rear tweets, but something must have.