Chord DSP 8000 or 8000R will blow you a way if you can find one to audition.
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What about a used MC-12? Don't know if that is still too expensive, but it would have the functions you desire- multiple subs, and room EQ if you get a v4EQ or v5EQ version.
Unlike the MC-8, the MC-12 can also digitize analog inputs, which I believe is required for applying room EQ to analog sources.
That will also give you ability to apply Logic 7, DPLIIx (with v5), and to do bass management, speaker calibration, speaker distance, and other adjustments in the Prepro. I realize there are varying opinions on sonic aspects of an A/D and subsequent D/A conversion, versus the functionality that provides, but it is an option that would be available on the MC-12.