These ads make me sad...
"Older Polk Audio speakers (I was going to put a good sub in them). They work fine now though. I did remove one of the passive woofers and tossed it. 2 other speakers that work fine as well."
http://seattle.craigslist.org/see/ele/424941150.html
http://seattle.craigslist.org/see/ele/424941150.html