I thought I calibrated my PB12 properly when I set everything up about a month ago, but late this afternoon when I popped in James Taylor Live at The Beacon Theater (excellent DVD, btw) I noticed that I didn't hear the bass guitar like I wanted, so I turned the level up. WOW! Unreal! I only had it at ~1/3 up, but ended up @ 3/4. I don't really know how to ask this question, but here goes: Do you turn the level up, say 1/3 to 1/2 and then calibrate it from there? Or what? Does that make sense? Also, where do I set the Crossover Frequency? FYI, I'm running the Onkyo 600, and am using both line level inputs from the sub. Thanks!