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Originally Posted by minister  i think pascal has made the case already....
but, do you know what a crossover is? Pascal can tell you about his Fourth-Order Linkwitz-Riley crossovers — which as you know are comprised of two cascading Butterworth filters for a slope of 24/dB per octave. These are quite common these days. The StudioComm units employ 2nd order Sallen-Key — and, any order Linkwitz-Riley filters can be implemented by a cascade of 2nd order Sallen-Key filters.... With 78/79, there is a steep cutoff for LFE with a more gentle 12/per for hi and lo pass to the mains. The MartinSound MultiMax unit does not discuss what crossovers it uses...that I could find....maybe seriousfun will enlighten.
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What you are referencing to is related to bass-management, which is not the same as the crossover that I am referring to. THX provides THX Cinemas and THX Dubbing stages with a product called the D1138 (being / has been replaced by the D20). This product provides the crossover filters for the front screen channels approved by THX (2-way / 3-way etc). It also provides some EQ and also screen loss compensation. The D20 does allow for bass-management, although it is not common for most cinemas or large film style dubbing stages to use this type of feature.
Anyway, there you go...
Cheers!