Russell- I believe its 150 wpc versus 100 for version 1. I had version one, and thought it was great- favorite SS. Have not heard version 2, but understand it exerts slightly more authority over the woofers for bass response. I read somewhere that some thought that version 1 of the Concentra was (slightly) warmer than version 2 (kinda like the ARC Ref 2 preamp MK1 vs MK2 analogy), although both of course have the patented Rowland SS musicality. Hopefully others will be more helpful- good luck!
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