Hopefully, this is the right spot for "room design" type posts. I've got a studio space (as in art, not as in sound) that is both fortunately and unfortunately a high-ceilinged concrete box. Roughly 44' L x 22' W x 18' H, with a 14' deep mezzanine. (See pictures.)
Currently, I've got two large-ish cerwin vega 3-way speakers about 12' off the ground on a ledge in front of the main windows (see second photo), and a woefully underpowered Denon receiver.
The sound is pretty terrible. If I EQ the heck out of it, I can get a fairly well defined high-mid range - meaning that vocals are discernible and things don't sound muted, though it is sort of an echoey "big hall" sound that's tiring to listen to after only a couple minutes. But unless you're standing right underneath them, the bass is noticeably "thin", and cranking the volume results in a muddy mess.
I realize that this is to be expected, given the makeup of the room. But given the stipulation that I can't blanket the place in foam / shag carpeting, or rebuild it so it's oblong or whatever, does anyone have tips for how to get a cleaner, more balanced sound? Can I mitigate the drawbacks of the space through speaker selection and placement - maybe by clever location of some subs, and getting coverage for the rest of the range with more numerous, smaller speakers instead of hammering the sound through the space from two big ones?