What, if anything, is a reliable room analysis(RTA?) program that I can run on my laptop to check room response, speaker placement, sub x-over, etc.? Does such a thing exist, and if so, what would be involved? I have recently purchased a laptop and want to broaden my horizons in this area. I would imagine several microphones are needed, and who knows what else. I understand there is probably considerable cost involved for some programs, but I'd at least like to look at my options. Thanks for any suggestions.