Hello from London, UK

[James]

Thank you so much James, I think I should focus on exactly the suggestions you’re making - correcting room modes in this way, I suspect would yield audible improvements.

I’ll research and revert soon.

Happy Easter!

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.