David,

I have had the PB1+ and 20-39PC+ in my home...next to my VTF-3. From what I heard, the SVS's did not articulate as well/the "attack and decay" were not as clean. This is not a knock on the subs, because if I didn't have a VTF-3, I would not have known the difference....and would have been ecstatic with either one.

The PB+ was better than the 20-39PC+. The PB1+ and VTF-3 were more difficult to tell apart.

My understanding is the SVS Ultra subs do a better jub in that area, but I have not heard them.

-curtis