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GK 800RB vs. MB800

The biggest difference I see: the 800RB is 400 watts total and the MB800 is 800 watts.

That, plus the 800RB has a bi-amp output, with 300w for the low frequency side and 100w for the high frequency, and a crossover point that's adjustable from 100 to 10000hz.

Plus, the 800RB is a class AB amp; the MB800 is class D. And there's the size and weight...