For spoken word, I'm using either an AKG c414,...
I don't know if you've experienced this, but the home USB microphones, in addition to having "restrained volume," don't filter the DC/battery system. The most obvious problem this can cause is the "Yeti Curse" where USB data leaks into the sound.
http://kozco.com/tech/audacity/clips/US ... neClip.mp3
But that's not the only problem. These microphones can also produce noise below 20Hz and some of it can be loud enough to keep you from passing ACX noise test "for some reason." The noise is below audibility, so you can have a performance with dreadful rumble/thunder/earthquake noise nobody can hear.
That picture is the Main Conference Room which is fully sound treated including padded air conditioning ducts.it's not a "booth," the room can be considered a "treated space"
Most posters are trying to do this in the apartment with white walls and polished wood floors. It's difficult to get a good, clean reading with conditions like that.
ACX knows. They have (as far as I know still there) a video where they describe the walk-in sound booth you're going to build in your apartment.