PSW505 $190 vs. Bic F12 $187.90

PSW505

There have been heated discussions over which of those two subs has the edge. I'd lean toward the PSW505. But I don't think you could do wrong with either at the <$200 price.

However, the Klipsch RW-12d has consistently been on sale at least about once a month at Newegg. It is definitely a step up from the PSW505 and BIC F12. You could consider selling your PSW111 and wait for the RW-12d.

http://www.hometheaterhifi.com/volume_12_2/polk-psw-505-subwoofer-4-2005.html - Ed Mullen review of 505, little output below 30-35 Hz but still may be reasonable for music and some HT situations. “As expected, room gain helped considerably to improve deep extension, with the Polk holding flat to about 25 Hz, and then dropping to –10 dB at 20 Hz.” Polk sub amps have generally been quite reliable.

You can do a search on Archaea's excellent review of the BIC F12.

http://www.avsforum.com/t/1390563/klipsch-rw-12d-omnimic-frequency-response-graphs - excellent review by Archaea, subwoofer RW-12D has been discontinued by Kliipsch (Oct 2012) but can still be purchased at some retailers. Often listed at $499 or $599 but is a real bargain when sold at $299.

www.data-bass.com has excellent reviews by Josh Ricci of a number of subwoofers including the BIC PL-200 which would be a step up from the F!2 and 505 but not the RW-12D (when at its sale price).

I hope that one note wonder serves you well.

505 is much superior in my opinion.

I upgraded to the RW12D from almost the same setup as you.

Polk M70 Series II, CS2 centre with a PSW111.

I'd skip a step and go for the RW12D for an extra $100. Incredible value for $299 and it will likely go back on sale very soon.