Using the "golden ratio" for room dimensions seems quite popular and I feel it has merit. It is 1 : 1.618. Also, I want to add that IMO it shouldn't be a very large room. A large room looks nice and impresses friends but it eats up a ton of power and requires big speakers, both of which limit your equipment options substantially. My future room will be 14x22 and no more.
A local hifi friend of mine has experimented a HUGE amount with room treatments and he has settled on DIY Corning 703 absorbers. You can buy it for about $10/lbs direct from a Corning distributor (check you yellow pages) and it does seem to work very well. I am going to make some bass traps for my system soon this way. Good luck! Arthur
A local hifi friend of mine has experimented a HUGE amount with room treatments and he has settled on DIY Corning 703 absorbers. You can buy it for about $10/lbs direct from a Corning distributor (check you yellow pages) and it does seem to work very well. I am going to make some bass traps for my system soon this way. Good luck! Arthur