Generally, I toss whatever guitar amp I'm using on top of an extra speaker cabinet. This guitar the amp at least 3 feet off the floor.
I haven't figured out a good way to get the drums off of the floor. I've considered going with a riser, but have never went through with it. Is there another way to get the drums off the floor. I do have an 8'x 8' piece of thick carpet that I use under the drums. I don't think this counts as "getting the drums off the floor", but I thought I would just mention it.
In regard to the 400Hz idea, I'm not saying that there is a spike @ 400 Hz but does not effect 350 Hz, for example. I may have mentioned that I recorded a drumset live at a bar that I've recorded multiple times. I've actually recorded this same drumset in 4 different rooms. Once in my current room, once in my older room (8'x12'x8'...not good), once at his house, and once at a local bar. The difference between the sheen on the cymbals, crack of the snare, and lack of mud in the toms was night and day when you compare the solo'd overhead tracks from the bar and my studio room. In fact, I listened to the tunes that I recorded at his house over 1 year ago and I could hear a huge difference.
Whether you call the problem of the room 400Hz, or too much low mid, or mud, or whatever, I know there is a problem. I guess another way of saying it would be "lack of high end". Some suggest the problem is due to excessive early reflections and I can't deny this, but I can't see myself extending the ceiling another 10'.
I don't claim to be an acoustician. If I was going to eq the room I would immediately start yanking out 300-500Hz. I'm sure I could come up with a test. I would need a completely flat studio monitor and a completely flat mic that I could stick a meter or so away from the speaker while I play pink noise (or is it white noise) it. An RTA would give me a good idea of what's going on.
I've got a pair of Mackie HR824's that would have to suffice. They seam to be fairly flat in an anechoic room according to the included data. However, I certainly dont' have any flat reference mics. I don't think a AKG 414, SM 57, 421, Octava MC012 or any other mic I have would suffice as a testing mic.
What's the deal with mic stands? I've never heard that being an issue with the room.