Re: please help me out with my cavalier
Go to your local Tweeter store and listen to Boston Acoustics RX47's. Nicest 4" coaxials I know of. If $139 is too much, their FX4's are also sweet.
As for the Cavalier, find yourself a Chevy message board and ask them. I did a quick search on Yahoo for "Cavalier message boards" and got lots of hits.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's