It is extraordinarily difficult to set any equalizer just by listening. . .

It's not difficult, just time-consuming. It took me about a month of fiddling to get it close to where I wanted it, then much longer to fine-tune it. The trick is to make small changes and live with them for a while before moving on to other changes.

But I agree that a real time analysis would be much faster and much more accurate. I'm interested in knowing more details of how you went about doing this, because I've always wanted to try it. Is the RTA software freeware, is it something I can download?