Brian, I'm still puzzled by what you're reporting about the bass extension of the on-wall M22s. The Axiom spec for them does in fact show less extension than for the regular M22s, but not by a huge amount(about 10Hz, down to 70Hz). Unless the Axiom spec is wildly inaccurate, this would appear to be suitable for an 80Hz crossover, and certainly 90 or 100Hz. Just about any sub could be blended with that.

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Enjoy the music, not the equipment.