Martin Logan speakers are very demanding. I have a pair of Monoliths and love them. The basic problem is the panels reduce the impedance loading to 2 ohms and below during some passages of music. Then the woofer asks for a big voltage for that kick drum to come in. The combination is almost unbearable for any modest powered amp. An amp that is stable at very low impedances (Krell, Levinson, some of the Classe) can keep it from clipping, but you still have huge demands on the amp. Bi-amping completely solves this issue, but of course that can be pretty expensive. Hope that helps.
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