I listened to the M105/106 and they sounded very good..imaging was amazing. They are part of the Performa 3 series and im pretty sure the revel website explains the difference.
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I listened to both when they were new to the product line.
I own the F32's as the budget wouldn't stretch to the F52's.
But I remember that F52's Performa2 had much better delivery and presentation across the board. But I have also listened to the new Performa 3 series and now am wanting those as they offer a distinct improvement of the Performa 2's. They just keep getting better.