Howard, welcome to Axiom for you and your gorgeous media room. When you say that the "lower range" is a bit lacking in the M80, I assume that you mean is that the low frequency extension isn't as low as you'd like on some 2-channel material, not that what's there isn't loud enough. If so, neither the M100 or LFR1100 may be the best solution. These speakers have a low frequency extension quite similar to that of the M80 but are able to play at an even louder level in the low bass because of the three woofers they use. For greater bass extension with 2-channel material the efficient move is to use one or two subwoofers crossed over at perhaps 60 or 80Hz.
You shouldn't feel that somehow using just main speakers is a "purer" approach, since subs, both by their inherent design and by being able to be placed better for bass reproduction, simply can do a better job than the mains can alone.
