According to Audyssey, BassXT pushes the speakers' two passive bass radiators "for deeper notes," while Audyssey EQ accounts for "common acoustical distortions that other speakers fall victim to, keeping clear and balanced audio in all situations." Finally, Audyssey Dynamic EQ makes "continuous adjustments to account for the way humans hear at different volume levels."
How do they sound?
As I said, lots of processing going on here and the results are generally quite good, particularly for Bluetooth speakers. The sound is detailed, the bass is punchy, and the speakers can play pretty loud without distorting. I put them up against the Edifier Prisma, a 2.1 Bluetooth system with a separate subwoofer, and the Audyssey Wireless speakers had more kick to them and sounded clearer. It was also nice to only deal with two speakers instead of three, and fewer wires. That said, the Edifier system ($129.99 list) cost half the Audyssey's price and seemed like a comparatively decent bargain.
I listened to the Audyssey in our fairly large audio-testing room, which has high ceilings. As I said, the speakers played pretty loud, but I didn't think they were quite able to fill a large room and sounded a bit underpowered when I moved beyond 10 to 12 feet away from them. In other words, they will be at their best in smaller to medium rooms.
The Audyssey Wireless Speakers offer a good combination of attractive styling, the convenience of wireless audio streaming from mobile devices and Bluetooth-enabled PCs, and very good sound quality, particularly for a Bluetooth speaker. Are there wired speakers that sound better in this price range? Sure. For instance, the Audioengine 2 speakers, which retails for $199, are better-sounding media speakers. And yes, you could hook up a $30-to-$40 wireless Bluetooth adapter to turn them into wireless speakers. But that would require more wires, and there's something to be said for Audyssey's digital processing, which helps get the best out of Bluetooth.
Bottom line: while they may not be a bargain at $250, the Audyssey Wireless Speakers are definitely worth strong consideration if you're looking for a set of wireless media/PC speakers that perform well.