The thread Alex linked is probably the best source of information, since it includes commentary from both Ian and Andrew on the design.

I think there is a pretty fundamental difference between Axiom's design and the one from Def Tech. Namely, Axiom's DSP unit (and required wiring) not only makes the LFR1100 more like an Active loudspeaker design, but also deliberately calibrates the rear-firing drivers differently than the front-firing ones. It seems quite a bit more sophisticated to me.

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