I'm currently running the SVS AS-EQ-1 with a pair of HSU ULS-15 sealed subs. Prior to installing the ULS's, I had a pair of SVS SB-12s (the predecessor to the SB13). The SB-12 were excellent and blended very well with my mains, but I needed a little more headroom in my open floor plan home. In retrospect the SB12s offered tighter bass, but less impact than the ULS-15s. I kind of wish I still had them.
Of course it's not possible to make an accurate prediction, but I would bet a pair of the SB13s would likely improve on sound quality over your single PB13.
Hope this helps.
Of course it's not possible to make an accurate prediction, but I would bet a pair of the SB13s would likely improve on sound quality over your single PB13.
Hope this helps.