John & Randy,

I don't doubt the robustness for a single minute. But at what point does sinking more power into a speaker result in more heat loss than SPL gain? If you were to plot the relationship of SPL vs. input power, where would the knee of the curve be? Do you see where I am heading?

BTW, I am fascinated by the thirst for more power on these forums . It's something I'm trying to wrap my head around. I have 4,000 very live cubic feet and sit 8 feet away from my M80s. When I am listening to music, if I put more than a few watts into the M80s, I start to lose the imaging (not the center but rather left and right of centre) and I suppose this is due to reflections. And frankly, my ears can't take more than a few watts for a half hour listening session. I listen to music with less than a watt per side giving me 89W of headroom on the amp!