FYI I just installed 2 of these http://www.eclipse-web.com/sw7100/sw7124.html
the 4+4ohm dual coil version in a sealed box with each sub getting 1ft. The PPI is also pushing some PPI DCX 650 Components and Massive Audio 7" midbass(actually they are the woofers from a MA component set but they act as fine midbass)
Initial results are pretty **** amazing. The bass is extrordinarily detailed, tight and PUNCHY as all get out. Highly reccommend this setup for those of you looking for a one amp system. Very impressed by this amp.