I am using an all-Dynaudio setup with a Sunfire Cinema 5-channel amp, and an Acurus A 200 amp, driving a pair of Dynaudio A70's, a Dynaudio center channel speaker, and 2 pairs of A 40's using a Lexicon DC-1. The Dynaudio's can use a LOT of power (even the A 40's), so I would be hesitant to use a receiver to power the 72's or 82's. If you are interested, the Acurus A 200 amps are going for about $550 new through EBay auctions (that's what I paid for mine).
I believe you'll be better off with the Dynaudios but your ears have to make the decision. These are completely different speaker designs and I'm surprised that they are competing against one another. Good luck.
I believe you'll need more power. I have the SR7000 and think it's a great rec.....but.....I would not try effectively driving those speakers with just the SR7000. Get an external amp. It'll be a great setup.
Due to different design, the sound of Dynaudio is more "focus" and Mirage is more "surrond". I don't think SR7000 give justice to these speakers. If you like speakers change SR700 for top of the line receiver of Marantz (i.e. SR-14), but if you like sr7000 , give a listen for PSB speakers Image serie.
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