Ok, so I have been doing a lot of reading, and research. I have narrowed my choices down to 4 subwoofers. The issue is, I still have a little trouble understanding all of the subwoofer parameters.

I would like to run 2 subs, either 10" or 12". I have approx. 4 cubic feet total to use after sub and port displacements. They will each get 300watts rms. I do not intend to do any kind of spl competition, I just want loud clean bass.

The front stage will be a set of Focal 6.5" seperates (either access, or polyglass). The vehicle is a Chevy Colorado extra cab.

Here are the subs I am considering. Please help me choose based on the info above, and any experience you may have with these choices.

SSA DCON 10 or 12
FI X10 or 12
DD 510 or 12
Arc Audio Arc 10 or 12

Thanks in advance for any help.