Today I hooked H660 to the PDX-5 and surprisingly I don't see any noticeable difference. Music stage has been dragged a bit to the back, more towards the center of car, just behind my head towards the center. Volume is reduced a bit (yes I did increase H660's volume to the max) and rear PDC sensors aren't making any noise anymore, front one does.
I only connected the front to the L2 and R2 input of H660 as they are full range. Only thing I couldn't do is to connect PDX5 both sub input as I didn't have rca splitter connector. H660 gives only one sub out rca female and PDX has two input despite giving one mono output. Not sure if this makes a difference.
Tomorrow I will try stereo output connecting all 4 lines in and see if that makes a difference, if not it goes on ebay.
Last edited by afsar; 01-21-2012 at 06:56 PM.