I recently upgraded my system from the Polk Audio R series to the RTi series. It now consists of fronts: RTi8, center: CSi5, surrounds: FXi5, and a new sub: Velodyne DLS3750R. I'm using a Denon AVR-2805 to run them. It's night and day compared to what I had. I used the Radio Shack SPL meter to calibrate them: FL +0.5, C -0.5, FR 0.0, Surrounds +1.5. I have the sub at 0.0 and settings on the sub at Low Pass Crossover 120hz, High Pass Crossover at 80hz. The sub cable is going from the sub pre out on the receiver to the LFE IN input on the sub. The crossover is set to 80hz in the receiver. Basically I'm looking for any input from you guys that I'm getting the most out of my system. I don't have a lot of experiece setting up a subwoofer, at least a good one anyway. Any suggestions or comments would be appreciated.