The Dyns need a lot of juice to make them sing. I use a Plinius SA 250 MkIV (450 watts per channel-4 ohms) with my 3.3's. I am very pleased with the full dynamic range of sound, exceptional bass and it's realistic three-dimensional soundstage with an excellent balance of depth and width. I would also highly recommend Pass X350 (or higher). Tubes are another option and will definately add warmth. I'm not that familiar with many different tube amps, but the Atma-Sphere, Audio Research REF 300 or 600, and BAT have strong followings.
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