I wonder if anyone is using the minidsp 2x4 HD units for HW?
https://www.minidsp.com/products/minidsp-in-a-box/minidsp-2x4-hdI have been playing around with the (cheaper) 2x4 version for a while, with a view to controlling room resonances without a full blown DRC setup, and with some success.
Looking at the more sophisticated 2x4HD version ($205 at the moment), I have just realised that it comes with the ability to take it's input from USB via ASIO (24bit at up to 192kHz).
There seems to be considerable scope for using one of these units to deal with all of the subwoofer end of things, and without using up 2 channels of o/p from one's main interface. Each of the two inputs has a separate 10 band parametric eq, followed by a matrix switcher into 4 output channels each of which has fully controllable independent crossovers and another 10 bands of parametric equalisation.
The interface to program these is a bit of an acquired taste, but manageable.
Note that I haven't got one of these yet, though I might well do so and see what it's actually capable of.
Nick