Has anyone had much success recording big amps in small rooms?
Even with smaller amps, you need to close mic to keep the room's contribution to a minimum--unless you are in a great-sounding space. The biggest amps I record are 40 watts. They're plenty capable of filling a bedroom with noise that you don't want to record. It's manageable by placing the amp in the right spot in the room and the mic close to the speaker. A mic with good off-axis rejection helps. What amps are you recording?