Andrew, several suggestions for changes of varying degrees of complexity have been made. The simplest change to eliminate the 4 ohm "problem" would be to introduce the VP180-6 and M80-6, involving no changes whatever, but rating the speakers at a 6 ohm nominal impedance, rather than the 4 ohm minimum impedance, in accord with typical practice in the industry. This would also have the substantial benefit of reducing the time and space wasted on the boards in discussing whether certain receivers would "work" with certain speakers.

If the M60 is to be modified, again the WTMTW configuration proposed would most nearly follow the VP180 pattern.

If the M60 enclosure(which would have to be modified in any case)could be increased about 1" in height(when horizontal), the 5 1/4" mid-range and the tweeter could apparently be placed in the desirable vertical orientation, especially if the tweeter mounting plate was partially cut away to allow for closer placement.

And to toss out something totally different, with the present sized M60 enclosure a triangular configuration in the middle, composed of the tweeter directly above two side-by-side 4" mid-ranges would be feasible and undoubtedly would astonish Axiom critics on certain other forums.

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Enjoy the music, not the equipment.