I just got my avia dvd today, I decided to check out the audio calibration after doing the video related stuff. I was checking out the sub calibration, and I notice that the sub tone is not as loud as the center or main, is this because of the lower test tone? I also notice that around 60-70hz the bass seems to drop off but comes back up just below 60 hz when doing a 100hz-20hz sweep on the LFE channel. I don't have a SPl meter yet to verify this but will next week I can post spl levels at various levels if needed. The dip in response is definitly there though I readjusted the levels (neighbor apparantly changed it to - 4db instead of +4db) and it seems to be better now. Is this normal or should it be fairly flat, I know it will dropping off at low frequecies , but don't understand a dip around the 70-60hz range. The sub is a Infinity Entra powered (125w) 10 inch sub, running off a HK AVR125 with all speakers set to small in a medium-large room. Various sub locations have been tried and phase and gain settings have been tried also.