I picked up a new HT setup on the weekend (Polk RTi10's for main CXi5 for center, FXi3's for surrounds and a new Polk 404 powered 10", I also picked up a new Yamaha RX-V2400 to power everything) For demo purposes I kept my old Polk RMS 350 powered sub to see if there was a great deal of differance, I also picked up a a Y spliter to have both subs going at the same time. After hooking up the new 10" I have noticed a big lack of lows on everything. I have one set to 180 degree phase and the other at 0 degree. I have played around with switching the phase and no big differance, am I doing something wrong.....???