Are you willing to separate the add ons? May be interested in the Nav.
Free bump for OP...I have this HU and it does do hi and low pass filtering. It is effectively a full active crossover and has a silly number of pre-ins and outs. I have mine hooked to a mono sub and and a 4 channel and the ability to fine tune everything is sick. Full Dolby 5.1, DVD, DSP, etc....my guess is that Kenwood put TOO much into this and had problems selling...jmo.