I just can't seem to get my sub calibrated correctly, and I believe the fault lies in the way I'm doing it. Let me go over what I'm doing and you all can point out the obvious flaws Ok, first of all this is a HSU VTF-2 I'm talking about here, which I got along with my Ascend system. My Onkyo 797 reciever has the speakers set to "small" and the sub set to "on" and it is hooked up via the input that bypasses the sub's crossover. I have it in a corner of the room, and it is set in the "one port closed" position for deeper extension. When I first calibrated it, I set the volume knob to 1/4 of the way up, and after using a RS SPL meter I ended up with the sub at just +1 on the reciever. However, this didn't seem to give it much punch. I then read somewhere on this board (can't find the post now) that I should set the volume up to 75% (or 50% if that was too high) and set the db's on the reciever to like -9 and calibrate from there. I tried this, but now when I play something with heavy bass (like the asteroid shootout scene in Episode II) the sub makes a loud POP! when something really strong happens. I've not experienced this in a sub before, but I can only assume this is the sub bottoming out or something equally bad, so I turned it down. Now I'm wondering how exactly should I approach calibrating it to encompass everything (the channel level setting on the reciever, the sub's own volume knob, etc.)? Should I try maybe setting the speakers to "large" and trying to use the sub's own crossover? I'm not sure what the Ascends' lowest hz is, but I could find that out I'm sure. Sorry if this post has been long, but I'm really disappointed in my subs current performance, any help would be greatly appreciated. Thanks!