I'm glad to see room correction vendors finally taking the multi-sub issue seriously. It's about time. For this to work well for typical consumers, this means the hardware used must be controlled very carefully by the software vendor. MSO allows the use of inexpensive IIR-based DSP hardware, but figuring out the required filter parameters in the IIR case has no known closed-form mathematical solution. For this reason, optimization software, which is prone to all kinds of glitches, must be used. But appropriate FIR-based hardware can be used with closed-form mathematical approaches to get answers to consumers fast, and even give linear phase to the results (regardless of whether or not this is audible). This is, IMO, the future.