I was wondering if this enclosure will fit under my back seat. I plan to pair it with new 6x8 spekaers and a new head unit. Just looking for a little bass.

http://www.circuitcity.com/ccd/produ....do?oid=150746

 

That will not fit. You need a custom box to fit under the rear seat. I have one that was installed in my 01 S-Cab that I'm looking to sell. Let me know if you are interested.

 

What about this?
http://www.circuitcity.com/ssm/Kicke...oductDetail.do

How many channel amp do i want?

 

that MIGHT fit but you need to get a tape measure out and get the box specs.

 

For the price of that box that you mentioned from Circuit City you can get one from SuperCrewSound.com for a little cheaper i believe and thats designed to fit perfectly in the backseat.

 

You're planning on using a sub with HU-powered door speakers? Most HU are 25W x 4. That will be quite a mismatch.

Use your HU to power the rear speakers and buy 4 ch amp. Use ch 1 & 2 for the front doors and bridge ch 3/4 to power your sub. You'll end up with a well-balanced system that way.