Well, based on what Ive read about calibrating an SVS, I setup my system and now seem to bottom out on heavy bass scenes. The one scene I'm using is the helicopter crash scene in the Matrix. I have a Samson S700 and a 20-39cs. For my settings, I have the knob on the samson turned all the way up, and the subwoofer level set to +2. This matches my taste for bass in alot of parts of the movie. When turned up to around volume 55 on my onkyo 595, During the helicopter crash, the sub bottoms. So, I set it at like -1, and it no longer bottoms. But, during other parts of the movie, the impact is lessened and alot of waves no longer felt. My question is this, in everything Ive read, it says to turn the knob all the way up on the amp, and then set the level for the sub on your reciever. Could I get some more headroom by not turning the knob all the way up on the samson, and then adjusting the bass level accordingly? I like the bass to be more pronounced than most, and I listen to alot of movies kinda loud (well it seems loud to me). I usually listen to them at volume 55 on my onkyo 595. So for all other parts of the movie, I have the sub set at around +2 or +3, and it souds completely perfect, but it does bottom out in heavy bass scenes, such as the helicopter crash. I dont have the Shack SPL meter yet but looking to buy in the next week. Can you make any suggestions? Do most people run the gain all the way up on their samson?