I couldn't find anything about the Paradigm PB-10, but I can safely say that the EP500 will BLOW it out of the water.
The EP500 has a digital amp with technology built into it so that it can't ever be overdriven. It has a DSP chip in it with all of it's 12" driver characteristics programmed in, so it can control the frequency response of the sub so it is nearly flat. It really is an awesome sub. It is definitely one of the very best subs at the $1000 price point.
Also, the Paradigm "Monitor" line really doesn't compare to the quality of the Axiom line. If you read Paradigm's website, the "Monitor" line is referred to as a "value" line. For a more appropriate comparison, the Reference or Signature Paradigm lines compete with the Axioms. However, if you look at the price, the Axioms really shine through as the winner.
Good luck on your audio decisions!
