I'm playing around with my sub and trying to figure out what sounds the best (calibrating a sub is a lot more work than the other speakers!). I have my X-30 controller set to 100 Hz (I have a Servo-15), but I have no clue what the cut-off is on my Onkyo TX-DS676. I've looked at the specs for my receiver, but I don't see anything mentioned in the specs about it. So, does anyone know? If it's lower, I would like to lower the cut-off on the X-30. Also, is the phase control supposed to set where you get the most bass output? Thanks in advance!