My pleasure.
It's a bit of a rabbit hole, but interesting to learn about. And with the equipment I got, it's not that expensive, considering the remarkable technology and improvements.
REW - Room EQ Wizard Room Acoustics Software
Dayton Audio UMM-6 USB Measurement Microphone (parts-express.com)
Behringer | Product | FBQ2496
There are other ways to do it, of course, but this was a simple way to add room correction to my old-school 2-channel system.