Well since I have both a b-day and Christmas coming up, I was wondering about going ahead and hinting about a new addition to my home theater to my girlfriend. I am very well school on many reviews on this site and others now about the benefits of a SVS sub, but since I have a Sony SAWM-40 I've been thinking that I am "ok" on the bass end. Has anyone moved from that sub to a SVS? The pressure though is getting to me and I trust you guys..So, I'm leaning towards a 25-31 since I am in an apartment. The neighbors have not complain much about the Sony, but it does boom a bit even after modifications. Will they get the same hangin 'booooooom' from the SVS if the material has that type of bass? I hear that SVS subs start and stop. What does that mean? On a scale 1-10, what do you assess the improvement I'll get from a 25-31 over the Sony when I move it out of the corner? 16x20x8 rm. Def Tech BP30's to small. 100-150watt amp to drive it. Or should I stay with the Sony since it's a fine musical/HT performer. Yes, I know...but I need a little convincing! Thanks!