It has only been 2 months since I got my SVS 20-39CS. It has opened worlds of new bass to me. But, there is a problem. The SVS will play anything that I throw at it, and because of that, I run out of headroom on action movies. I like to listen to my movies loud. I often listen at reference level (00 on my 3803). On normal movies, it is great. But on action movies the amp clips more than it should. And on LOTR:RTK I bottomed the sub a few times. So, I need more headroom. And I have an extra amp channel on my Samson S-700 (which is probably what bugs me the most, having gear that is not being fully used). Now comes the big question: Which SVS to get. Since I have the extra amp channel, I only need a passive cylinder. My response chartThe black line is after BFD. I have a nice hump at 20hz, and a slight roll off above 30hz (30-60hz is about -5 db compared to 20hz). Yes, you heard me right, 20hz is my loudest frequency. And I am only down about -2db at 16hz. The dip at 63hz is the crossover and the dip at 110hz is a room node. Also, my crossover is set to 60hz, and the graph shows the room response with the crossover enabled, so the upper portion of the chart is really the Studio 20's. Option 1: 20-39CS Just double up what I have. I should get about 6db more headroom, which is what I need. Option 2: 25-31CS The 25-31 is the strongest sub from 30+hz. So I figure it might help the roll off of my current sub. Since the BFD is 2 channels, I could equalize each sub seperatly, but that would be a hard task. Option 3: 16-46CS OK, I know it is more of an ego thing, but who wouldn't want a 46" tall sub that can hit 10hz? It may not help my top end as much (which is really what I am looking for), but knowing I could hit the ultimate depths would be cool. My room is 13'-6" x 12'-0" x 8'-0". It has plaster walls and hardwood floors. I have added (4) 4'x6' 1" fiberglass acoustical panels which helps deaden the room. 00 on my 3803 is calibrated to DVE reference level. During movies, normal dialog usually is in the low 90db range, and action parts hit around 100db. I know it is loud, but I like it to sound like the theater. Explosions hit the mid 100db range.