How do you know what room treatments to use?


I am thinking improving my system with room treatment. My system sounds “loud” (distorted?) when turned up. It is a high resolution, very good $100K system built over several decades.  I am getting a new preamp that will improve things but think that the room is significantly to blame. How can I actually tell what is amiss and what is needed?
mglik
“How can I actually tell what is amiss and what is needed?”

Fortunately, you don’t have to second guess. GIK Acoustics offers free and expert consultation. Give them a try! 

I started a room treatment thread in the Digital section recently.  Suggest you look there
I'm convinced that good room treatments will improve my system more than any single component upgrade. I just have to figure out what! ASC Tube Traps may be the first step, to control the bass. I have a small room, 11x15.