Imagine this if you will; starting with the sys. listed in my sig. Adding a two way external crossover set to send 800hrz and above to my Krell powering the rta 12c's than adding a parasound HCA 2003 ( just out of shop after rebuild ) at 800hrz and below to a pair of vintage JBL bass drivers( L123a's I believe out of a pair of JBL L100's) temporarily mounted in some sda 2 cabs with the cut outs for the 6.5" holes stuffed with foam and the tweets hole open for a port.btw parasound benched at 220 a side.the results are as follows... WOW.OMG.SUNNY BEACHES. ECT. ECT. THE WOUNDERFULL SOUND of the polks ,(just moded 170 hours so far) plus a bass that reaches out and SLAMS you in the chest ( from the jbl 12" drivers) and yet is so musical and clean that it has left a smile on my face that death couldnt remove.im just awed by the resulting sound this combo has achived.