Hi owldiscourse. I had that pairing for a while until I switched out the Diablo 300 for the Pandora and Antileon Evo. The Diablo 300 and S3 mk2 pairing was extraordinarily good. I haven’t listened to the A3s, but my feeling is that the Diablo 300 deserves not only the S3 mk2s, but even better speakers (this is my current dilema, especially with the Pandora and AE). Saw Mike’s post on another thread where he paired the Diablo 300 with the M2s and it doesn’t surprise me that it sounded incredible.