PB, there's no apparent good reason these days to resort to an obsolescent technology such as tube amplification. Be that as it may, the M80s certainly don't "suck mega watts of power" but in fact are slightly more sensitive than average and require less power. They also have a relatively smooth impedance curve varying between 4 and 14 ohms, with perhaps a 6ohm overall average.

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Enjoy the music, not the equipment.