I just ordered that MiniDsp 4x10HD that been listed on eBay for a few days. Looks like a 1RU unit.
I was holding out for a Dirac Live MiniDsp DDRC 88A with Bass Management, but they're out of production due to parts supply issues and used ones are rare and over priced.
I do have a MiniDsp Umik-1 mike with the correction file.
So, been reading about Dirac Live versus using REW.
Consensus of pro sound guys seems to be Dirac is very good, but better results can be had with proper use of REW.
My prior experimenting with REW was rather disappointing. So I need to learn more about it.
Going to build a rack out of square steel tubing to hold the 4 amps and rest of the system.
Bypass the JBL Millenniums crossovers, and pursue this. It's finally time.