I just got an email from Kenwood tech support. My VR-409 receiver has a FIXED 100Hz @ 24db/oct lowpass filter on the sub out. Nice slope, sucky frequency. This poses a filter-stacking dilemma. What do I set the crossover on my PB2+ at? IIRC, it's slope is 12db/oct which is not that steep. IIRC, a 24db filter + a 12db filter = a 36db filter which is 180 degrees out of phase. Am I right or just confused? Also, if the reciever sends a 100Hz lowpass, and I set the sub to 80Hz, what does that do for me/against me? I have my CV sub lowpass set at 80Hz and thought it sounded decent. But I'm stepping up in the world and want to ensure I'm good to go. Man, as time goes by and I learn a little more, I realize all the things my reciever is missing. The least of which is not an adjusable lowpass filter! Or at least a range of choices, i.e. 70, 80, 90, 100Hz. That would be nice.