What would you consider an ideal size for a one-room studio that would accommodate a band rehearsal setup, recording/mixing station, and extra amp stacks, guitar rack, etc.? We're looking at building a house with a basement and creating a studio within the basement--just personal hobby, not pro, and mostly going for isolation. My band rehearsal spaces have never been adequate, so I want bigger than what I have, but not bigger than I need, to keep expenses down. I've measured gear and drawn floor plans, but don't feel that's accurate at all. The size of the entire basement I think will be 800 sq ft and the studio would be no more than 400 to 600 sq ft. I thought 20' x 20' might be large enough, but now I'm not sure. Band would be drums, a couple of guitar amps, bass amp, keys, room for singer(s) and floor monitors. I recently left the band and so can't provide exact SPL, but loudest level would be to match an acoustic drummer hitting hard; I may buy e-drums to control volume. Any thoughts appreciated.