Does anybody make...

Higher end surround sound processors with matrix routing would work.

Would an active x-over work?

Check out Marchand Electronics. If they don't already have what you want they can probably build it........

https://www.marchandelec.com/

@roadwhorerecords ...yes , I believe so, thx

@jrpnde ,,, Awesome... Thanks

Okto Dac 8pro dac, 8 channels dsp. I owned Dac8 stereo, 2 channel version. One great dac, price performance ratio out of this world. Unfortunately, I heard not taking orders at present due to excessive demand.