As I speak I have 2 25-31CS+'s running off of a Sampson1000 amp. I also have 2 sonotubes with 4 Tempest drivers (2k watts) which gets insane loud. That upgrade bug has hit me yet again. Being out of the SVS loop for a while I see SVS now has newer "box" subwoofers that people are happy with. A couple of questions: What would be the comparison to 2 B4's with 2 krell amps to my current systems? Dollar for dollar is it a better idea to have 4 25-31CS+'s instead of 1 B4? Room not an issue. I'm torn between 2 B4's or building a 3 Tumult power system with 3K watts burrowing through it. Ahh the decisions.