Hi Ron,
I can't find a used PB-10 for $300 but I can find a local new one for $400.
In the meantime, I can get a great deal on a H100..... I read somewhere else here about the association between Dr. Hsu and Accoustech and I just found this on another forum:
"Well, I will gladly give my .02 on the BIC H-100 sub. Two thumbs up! I have Klipsch speakers which I am more than happy with, and actually just upgraded from the Synergy series to Reference speakers. I HAD a KSW-12 Klipsch sub, and was never really happy with its performance for either music or HT. Far too boomy and muddy, no matter where it was placed or how the system was tweaked. I did a little research on the BIC H-100 sub after reading specs and thinking "this is too good to be true". I emailed Jeff @ BIC, and he was quick to respond to my inquiry on the sub. He confirmed what I had been told; Dr. Hsu was the one who designed the H-100. In fact, if you look at the HSU Research STF-1 the amp is a near twin to the BIC's. 150w RMS and 500w peak with a BASH hybrid style amp. I ended up selling the KSW-12 on eBay, and the very same day I was loading it up to take to UPS the new sub arrived. I let it warm up in the house, hooked it up, and let 'er rip! I was absolutely BLOWN AWAY with the performance of it. Goodbye muddy, booming bass and hello deep, driving, clean bass response! I have not even dinked that much with placement yet; just put it in the exact same location as the Klipsch sub was in. The best part? The $199 + shipping price I paid! I got $250 + shipping for the old one, and ended up with a superior sub and $50 in my pocket."