Randy, that calculator isn't adequate since it doesn't take into account the contribution of room reflections to the total sound level at the listening position. Beyond a certain "critical distance", which may be about 5-6' in typical home listening rooms, the reflected sound is greater in level than the direct sound and remains relatively constant at longer listening distances. As I mentioned before, I made a rough calculation using certain assumptions(of course you may have heard about the physicist who was helping a farmer with a problem, and began "First, assume a spherical cow")and estimated that at peaks you were using about 100-110 watts.

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Enjoy the music, not the equipment.