Just received my new SVS 20-39PCi last week, and have been calibrating using Avia. I've found a nasty dip in somewhere in the 50-70Hz range (I have the Rives Audio Test CD on order for more precise measurements). In my readings in various forums, it looks like there can sometimes be issues with the receivers crossover frequency settings. What the heck is the crossover freq on the Onkyo TX-DS575X? I've been through the manual, but either I keep missing it, or it's not listed. Are there any adjustments to be made on the Onkyo side for this? Thanks - I have just enough knowledge on this stuff to make me dangerous, so please be gentle!