Another f**king stereo question, need a stereo EXPERT Options

[ninefourteener]

Last night I had Best Buy install some stereo equipment in my car. All of it was 100% new, and unopened, so it's highly unlikely anything was defective.

Already installed is a VERY nice Pioneer 8500 CD player

Installed a JVC 500 watt 4-channel amp. Not overly expensive, but not junk either.

Installed 4 brand new Pioneer 6.5 inch 3-way speakers in the factory holes.

In addition to my passenger door not opening from the inside, there are several other problems:

1) I can turn the volume about as loud as it was without an amp.... whether I use the volume on the amp or the stereo. Once I go above that, the stereo "shuts off" when bass hits, or.......

2) Occasionally, I'll get this rediculously loud "squelching" sound that won't go away until I turn the car off.

3) I spend $80 on a Rockford Fosgate insulated Amp wiring kit, but I still have alternator whine.

I have an appointment today to get their best technician (15 years experience) to "re-do" the entire thing... but I'd like to have a basic knowledge of what "could" be wrong. Basically, I'd like to know some good questions to ask, or solutions to recommend.

Please don't respond if you're just "guessing". If you're very familar with how this stuff works, I'd really appreciate any help you can provide. I'm not doing any work, but I don't want to just look stupid not knowing what to ask, and accepting whatever they tell me. Thanks.

Matt

[ninefourteener]

I'm sorry, I should have "OT'd" this topic... it's in my Acura, not the Porsche. Strangely enough, I've owned the teener 1.5 years, and have done only 1 repair.. the battery. The teener doesn't break.

Nevertheless, I think in the door, the linkage just got bumped off track.. no biggy.

As for wires/grounds/etc. They used an insulated and fused 8-gauge power wire to power the amp. Insulated RCA connections, and even Honda adaptors to wire the speakers in. They used all the right parts.. I spent $250 on the installation/parts.

If the stereo is shutting off fron lack of power, isn't that what the amp is for? If an amp is hooked up, shouldn't that be enough to power 4 6.5s??

I don't even have subwoofers in the car yet, these are just 4 factory upgrade sized speakers.

Also, once the stereo uses RCA cables directly to the amp (instead of power directly to the speakers), doesn't the radio cease to provide power to the speakers anymore? Shouldn't the amp be doing that?