There is a pro review of the X-A2 at this site - http://www.hifichoice.co.uk/ (click reviews at the top of the page). Further down the page is a link to the "old" reviews which include the X-A1 and the A3 (pretty certain that it is there). I own an X-A1 and based on this review passed on the X-A2 (not necessarily a wise decision). The review of the X-A1 is spot on, however. The differences between the X-A1 and the A3 are bass (as mentioned above) as well as a bit more clarity to voices (the A3) and a slightly warmer sound (the X-A1). Overall though I slightly prefer the mids of the X-A1 which I find to be more flattering though not as accurate. My X-A1 sounds its best when kept at moderate listening levels (plenty of volume for our medium sized room) and I am using 90db @ 4 ohm speakers. I suspect that it operates mainly in Class "A" at these levels. It still sounds very good at higher levels, but looses some of its magic. I now use it in a second system and also as a backup for my tube amp. The main amp is a 300B based SET and the fact that I also enjoy the sound of the X-A1 speaks highly of it, I think. Hopefully you will get some "real" feedback on the X-A2 model.
