I've owned a pair of the M3 Sapphire's predecessor, the M3 Triode Master, for over four years and used them in two different systems in rooms of very different dimensions. I experiment with distance from the front wall in both rooms from two feet to five feet. In both rooms ended up very close to the three feet distance so it will work. Right now I am listening to a pair of C7-ES3's at our second home and they are farther from the rear wall than that.
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Jack
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