There are many good responses explaining the science and approach to this problem. So I don’t have anything unique to add. I do highly recommend you look at the Acoustic Sciences Corporation (ASC) products. I have used them for the last 15 years. They have traveled with me to three different houses, five different listening rooms. The ASC Tube Trap is simple and elegant. Each Tube Trap is designed with an absorptive side and a diffusion side. This is important in that the solution for tuning a room is not always absorbing unwanted reflections or frequencies. By using a combination of absorption for removing unwanted bass reflections and diffusion for addressing mid and treble frequencies you can create great focus in the room, while still creating a sense of size and liveliness. Good luck on your journey. Cheers!
