Ed usually recommends not running the 1000 series with the 2000 series due to the phase response and port tunes resulting in cancellations. It’s the same with the sb3k and I agree with shady not to use that with a pb1000. If you’re staying with svs, it might be worth asking about trading up. If they won’t give you anything, what I’d do is sell the pb1000 and invest in a different pair altogether. That’s a pretty large space, and considering you’re looking for an upgrade after two years makes me think it’s time for something better. IMO Rythmik, RSL, PSA, monolith and HSU for example offer better value overall. Depending on budget, I would probably recommend a pair of RSL 12s.