That's a nice sized room that has the potential to sound very good once you put in enough treatment.
> Ethan's article is EXCELLENT ... I've read other books and articles ... My eyes would roll back into my head as I slipped into a coma. <
Thanks. Keeping it simple and free of math was a major goal.
> Would it help if I posted a link to an MP3? <
Not really, unless you just want to share some of your work with us.
> I would most appreciate some guidance about what kind of treatments I should use, and
where I should put them in the room. <
The usual advice is to install a mix of bass traps in the corners and mid/high absorption on the walls. Since your room is so large you may need additional traps on the walls. But you can start with maybe a dozen or so traps in the corners and see where that takes you. Besides the regular wall/wall corners there's also a lot of corner space at the tops of the walls where they meet the ceiling.