Originally Posted by Gistum
Originally Posted by Ethan Winer
Worst? Probably the strong reflections coming from the wall directly behind your head.
- What would you recommand to put on this back wall to fix this issue (size / location) ? I've read on your side that carpets and such don't do anything good, but if it's a square panel, it can still be aesthetical in some way.
The ideal back wall absorber would absorb equally well over a wide range of frequencies.
The conceptually simplest would be to build what is in effect a false wall approximately 4"-6" away from the existing wall, covered with fabric, and with a 2"-3" thickness of acoustic absorbing material (high density fiberglass, rockwool, or cotton waste) spaced 2"-3" away from the existing wall. Since the wall is not structural the vertical members could be thin lumber such as 1 x 4 or 1 x 6 (the missing 1/2" wouldn't make that much difference), and be spaced 2' to 4' apart so that the absorbing material (which often comes in 2' x 4' batts) fits in-between. Try to work things out so that the seams in the fabric are handled tastefully. I've installed absorbers like this and they are effective down to 50 Hz or so because their area is so large.
- Do you think putting some bass trap in the front right corner (the corner near the windows, behind the front right speaker) would do anything good (as it's pretty much hidden, I could fit something there) ?
Yes. That corner adds an acoustical asymmetry to the room. The trap should be floor to ceiling and fill the corner at least a foot or two along the walls There are several ways to add absorbing material:
(1) Simply fill the space with less dense absorbing material
(2) Use higher density material just behind the cloth covering that is stretched across the corner, and leave an air space behind it Air spaces can be as effective as absorbing materials when used with them.
(3) Bisect the corner with the absorbing panel.
Room sonic treatment's figure of merit is the surface area of the entire room divided by the area covered by acoustical material. There is a right amount and it is possible to go overboard. The usual mistake is to use too little,
There are places where acoustical material is more effective or less effective. Corners tend to be areas where you get more effect from a given amount of material and this includes the place where the ceiling meets the wall. Reflections off of side walls need to be managed.
You are limited in terms of what you can do to the floor because it has an important and well-defined important function (supporting people walking about), but this is not necessarily true of the ceiling. I can't imagine a 4 or 6 inch thick absorber covering all or part of a floor, but I have seen them on the ceiling, particularly a few feet in front of the speakers.
A good sounding room has a mixture of reflection, diffusion, and absorption. Usually diffusion costs the most per square foot covered, but its favorable influence is not to be dismissed. Diffusion and absorption are interchangeable to some degree.
The site linked below is chock full of examples of many different kinds of acoustic treatments. I'm not saying necessarily buy stuff from them (but why not?) but at least look at their wide palette of options to expand your mind: