No that would neither be a good
Idea or possible
Take the rcas from the amp and connect it to the + and - posts on one of your speakers.
All car speakers will go well with a 500 Watt amp, but for the best effect, get a power subwoofer.
depends on the wiring check out Subwoofer Wiring Diagrams
Most computer speakers with subwoofer have the power going directly to it, so it is needed to get an extension for all the other speakers.
It depends on the power rating of the subwoofer.
12 inch Bose speakers are what you want, along with a amp and subwoofer.
If it is a subwoofer amp then set it at about 80 hz.
in fact , some subwoofer with amp. you don't need buy amp. give you one good guide http://www.12vcity.com
Sounds like a blown subwoofer.
With Subwoofers only, you would want to go with only a 1 channel or 2 channel amp, 5 channel amps are designed to power 4 smaller speakers, and 1 subwoofer. Each channel basically refers to a different speaker - if you're using 2 regular left and right Speakers (not Subwoofers), use 2 channel setting, if you have 4 Speakers plus a subwoofer, use 5 channel setting. Make sure subwoofer is tested with the lowest gain/volume.
A passive subwoofer doesn't have a built-in amp and will require the use of an amp.
The RCA's from the amp will be arn to the CD player, then you need to connect the speaker's wire to the output + and - of the amp, this will cause the amp to have musical power from your radio, and the speakers to have the power from the amp..-Shocker