Sam, another thing to keep in mind is that the impedance of the M80s, as shown in the NRC measurements , is only near 4 ohms in the bass. The majority of the frequency range shows a higher impedance, and if the typical practice of rating speaker impedance at an average number was followed, the M80s would be rated higher than 4 ohms(and the occasional near-hysteria over the point might be avoided).

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Enjoy the music, not the equipment.