Drew, the exact details aren't known, of course, but for an increase of 4dB over the anechoic figure, also measured at 1 meter, the room contribution would indicate a somewhat livelier than average reverberation. A 3dB increase in-room is more typical. And of course measurements vary with frequency and meter used; for example, it can be noted that the NRC anechoic measurement for the M80s was 89.5dB.

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Enjoy the music, not the equipment.