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I would counter that the cost of amplification, especially if you are dealing with multiple low-medium power amps rather than a single high power amp are very contained today. So is the cost of a chip capable of the DSP needed to run the SM5.
And the kicker is that the R&D for the DSP's setting was already done for the passive version.
In the IN-x models, the Class D amplification and the DSP hardware are on the same monolithic TI chips, and I suspect that's true for whatever chips they used in the SM-5. There's probably more hardware cost in the USB and Ethernet connectivity aspects of the SM-5 design.
Given enough time and attention, e.g. deciphering the extant LEA tuning files -- along with the fact that the SM-5C's biamp mode requires only two channels of amplification -- one could probably use any of several decent 100+ WPC stereo power amps (as long they can handle three ohm loads) for each SM-5C with a MiniDSP unit (or some such) instead of the very pricey LEA gear Kali recommends, saving some $$$ at the expense of connectivity.
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