T, using the rating numbers the difference figures out to 1.87dB. Using M60s this would be roughly the difference between handling a 115dB or 117dB peak. It would be rare if ever that something would hit that narrow range(especially in a room the size of yours)and the 1080 would handle it better. Also note that on split second peaks the 1070 can probably supply at least 200 watts for a brief instant. The 1070 should be plenty, so enjoy, but watch out for your hearing.

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Enjoy the music, not the equipment.