Adrian, relating to the M60/M80 comparison, I'm reminded by Alan's thread on Mr. Marshall's recent M80 tests that his M60 test from about three years earlier was linked in the article and interesting comments made on the comparison. As far as I know this is the only source that has M60 response curves at various listening angles(the NRC didn't test the M60)and is valuable from that standpoint. If you didn't read that before, it might be of interest to you.

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Enjoy the music, not the equipment.