Troy, as Peter mentioned, the sensitivities of the C-7s and M80s are nearly identical(90dB using 1 watt for the C-7s and 91dB for the M80s). If everything else was kept constant, i.e. the same source material, the same speaker position, exactly the same loudness level(memory can be tricky), the settings(including impedance)on the 3805 should also be the same.

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Enjoy the music, not the equipment.