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For reference, the room is 15 by 22 and has a soffit (4' x 1.5' high)
1.Ok, if I have an AT screen and the LCR behind the screen, do I put absorbtion just in between the LCR or do I treat the whole wall from top to bottom with absorbtion?
2.On the side walls, when treating reflection points, does the absorbtion go all the way from floor to ceiling or is it only treated from ear-level to the ceiling with reflective surface underneath?
3.I was planning on a star ceiling, with the star ceiling I could also use rigid fiberglass board and use it as absorbtion on the ceiling, would this risk making the room too dead sounding or would it create a sound as if the ceiling was higher? (I heard this trick of using absorbtion on the roof when recording because it makes the room sound larger I'm not sure if it was all or what)
4.On the rear wall, I have diffusion planned by making the back of the HT DVD shelves and some absorbtion. Should the rear wall be treated like the side walls or should it be as dead as the front wall?
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Hello, please allow me to give my opinions and thoughts ...
1. Treating the whole front wall with absorbtion will help if the rear speakers is facing to the front wall (eliminating echo), but if you use a dipole speaker for the rear speaker and one of the side poointing to the front wall, absorption on the front wall will degrade the speaker's response. There're other thoughts, but this is the one that comes to my mind right away.
2. Treating the side walls for eliminating strong reflection can be done just at the ear's height only, but please notice that the greater absorption surface (and aslo thicker), the lower frequency it can handle. I guess ... it's just a matter of interior design too ... diffusion can replace the absorption if the room is dead already.
3. An absorptive surface will create a sense that the sound goes away (like if the ceiling is an open area) ... it doesn't make the room small/bigger. Well,, it might make the room smaller on the other thought, but the more absorption, the better imaging you'll have. Some people want the imaging to be really clear from the screen, and some people want the imaging to be wider/bigger. It's a compromi with the acoustician i guess ^__^
4. Rear wall treatment, again .. do you want it dead or live ? so either diffusiion or absorption ...
Hadi