I just got my system installed. It sounds awesome. I have 2 10" MTX 6000 subs with the thunder 4250D amp and it is loud. I love it. I sould have pictures pretty soon. The amp is very small. Its 7" X 9" and it puts out a lot. It runs the 2 mtx subs, with a 500 watt max on each, to almost there peak. I built my own custom box.

Doug

 

Oh ya, the system cost $650. That was just for the subs, amp, box materials, and installation.