[bpape]

You need to make your own decisions. I'll just tell you that I redo theaters and listening rooms every day that were initially done the way you're considering doing it. Yes, placement is important, key in fact. However, rugs, curtains, foam with cloth over it, etc. is purely upper mid and high frequency treatment that completely ignores the bulk of the spectrum and the part that really makes the most difference IMO.

Just trying to save you a redo later down the road and spending more money in the long run than is necessary. Also, remember that the person you're speaking with on the side is used to dealing with larger spaces where acoustic theory and treatment are quite different than in residential sized spaces. In particular, 250Hz down is dealt with exactly opposite in larger spaces than it is in smaller ones.

Bryan