I suggest a better HU than JVC. As well as going with the larger amp. You might not need it now, but if you need it later, you'll thank the stars that you didn't have to spend the money twice...

 

This is not question about HU. JVC already sitting in the car. I chose it because I've heard it in pretty good setup. I'm not saying it is the best, but I really like it and the sound quality is comparable with other good head units which usually more expensive.

Anyway, if Earthquake is not the best choice in there, what would you suggest?
As far as I see there are no too many subs that can fit under seat (that was the initial idea).

And again, would Audison LRx 4.5 with 130RMS per chan is good enough for K2P speakers?