I had the PB12 NSD before my PB13 Ultra and the NSD was a very good sub for the money just not as linear as I liked, the PB13 did the trick. The original SB sub was a very well designed and nice sounding sub from what I have read.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70