I have a subwoofer but like the speakers better without it. Ebay still has the other pair for auction at $325. I assume they must not be selling well for $2,400 since they are being auctioned so cheap. My pair are new.
Acoustic Technologies Single-Driver Loudspeaker
There were two pair of Acoustic Technologies Classic Series single-driver speakers on Ebay. They retail for $2,400 and the starting bid is $325. I purchased one of these for $325 as nobody else bid. They sound very good, especially for $325 if you like the single-driver sound.