I had an amp installed last week by a terrible place in berkeley(Best Auto Stereo) and to fix the alternator whine they put two noise filters inbetween the RCA's and the amp. I've heard about noise filters in passing, but never needed them before. (Seeing as they were replacing the exact same amp, i'm suspect about actualy needing them). I've got a few quiestions...

1) Do they lower sound quality? I go by the theory that anything in between the head unit and the amp must be bad, but I've been wrong before.

2) Because they're lazy and didn't open up the dash, they put them on backwards according to the markings. What's the the difference? I assume i'll just reverse them myself when i get some time....

Matthew