is it something you can tune you're speakers to suite, meaning the high frequencies?Curtians around the room can add a nice look. Just be aware that different materials have different coefficients of absorbtion (some are actually made for HT). They will tend to absord the higher frequencies, which can become too much rather quickly. The best approach is to measure with REW before & see how the curtians are affecting the room responce. That way you can taylor the amount & placement of the curtians you hang.