I am assembling my new system tonight and have a bass management issue to deal with. The new set is as follows: Yamaha RX-V640,PSB Image 5t mains, Image 9C center, Infinity IL-10s for rear, Velodyne DLS 3500 sub ( will be replaced by SVS next month) My Yam's sub output is has a built in, fixed 80hz crossover. Should I ... A)Set all speakers to small and use the sub out. This would cut all speakers ar 80hz and send everything else to the sub. The only reservation I have with this is the idea of wasting the lower end extension of my new towers. The supposed advantage would be better sound from mids and highs. I would bypass the crossover on the sub. B)Set mains to large and use the main pre-out from the Yam to send full signal to the sub and use it's internal crossover. I would set it at about 45-50 to take over where the towers should (I'll have to measure this) lay down. Should blend nicely but would I be pushing to towers too hard this way. My receiver is a bit underpowered at 85w per channel (optimistically estimated). Should I even ask the mains to handle the lower end at all? Ideally I wish I had a variable or non-filtered sub out to use. I have read that using the internal 80hz on the rec along with the on board x-over on the sub can cause some problems of its own. Thanks for all the help and comments I have received to aid in my decision making. I am quickly becoming addicted to this forum and HT.