Scott, I wasn't indicating in any way that the 607 wasn't a good buy, just that two wires coming out of the sub channel rather than one isn't a big deal. You already have a receiver that can drive your M80s to dangerously high(to your hearing)sound levels. More expensive receivers with a little more maximum power capacity would simply allow about 2dB more volume on brief split-second peaks. For example, a peak that could be played now at 106dB could be played at 108dB. Relax and enjoy the sound.

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Enjoy the music, not the equipment.