Even though I've heard people talk about it on this board, I've never realized how much the room and placement can affect the sound of a sub. I have an SVS 20-39PCi, which I absolutely love. I just moved into a new place and got my theater set back up. In my old setup, the sub gave a wonderfully smooth response. Even walking around the room, it didnt seem to affect the sound very much. I guess I was lucky to have such an environment. I fired up AVIA to calibrate it in the new room today, and the bottom end is GONE!!! Anything under 50Hz seemed to really drop off. I did a quick frequency plot with my RS SPL meter an there is a huge hump in the response from about 50Hz to 80Hz. It peaked around 60Hz. I tried playing a few bass-heavy DVDs and they sounded drastically different. Unfortunelty, I don't have to flexibility to move the sub around in the room to try and flatten the response. Looks like I will be investing in a BFD!! I guess this post is just for all you newcomers out there who think the room can't possibly make that big of a difference. I suppose I was one of those people until today!