Hi Andy;

Sorry to be so long in getting back to you. Acoustically, the crossovers in the Millennia line are 18db per octave (3rd order), crossovers to subs excepted. The crossover point from the tweeter to the 5 1/4" woofers in all of the models you own is 2500Hz; the M60s have an additional crossover at 300 Hz to the 6 1/2" woofers.

Ian Colquhoun
President & Chief Engineer
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Ian Colquhoun
President & Chief Engineer