I purchased my pair of A2's last week. The sound is very clean, natural and smooth. Sound stage is wider compared to my Logitech Z-2300. The highs and mids are great, but the bass is lacking compared the Logitech.
I hooked up the A2's to my DAC's RCA outputs, then I hooked up the Logitech sub to the headphone out and disconnected the Logitech satellites. At first, it sounded pretty good, wider sound stage, better mids/highs combined with the Logitech sub's strong bass. After a while, I noticed that the "thump", though satisfying was a bit unclear. Using only the A2's, the bass was lacking but I could clearly hear the instrument playing the low range sound.
I'll probably get around to writing a review when I get the time.