Originally Posted by Nyal Mellor
Originally Posted by Silva741
I’m currently planning a dedicated room for stereo (and also home-theatre duties), and I’d love to have a screen wall similar to some of the lovely home-cinemas shared by members here, covered with black velvet. I’m sure it works beautifully when watching/hearing a movie, but regarding specifically 2 channel audio, does anyone know what kind of effect the fabric has?
The room I'll use has rather thick solid walls precisely to guarantee good sound quality, and as much as I’d love to have the look of the fabric on the back wall, don’t want to jeopardize the sound in any way.
I think i never saw a stereo dedicated room with one or more walls covered with fabric, maybe that’s the reason?
Velvet is very black yes but it is not acoustically transparent. This is the material I use now for screen walls http://www.parts-express.com/pe/showdetl.cfm?partnumber=260-332
. It's a very high quality speaker grille cloth. Nice and weighty, very black and acoustically transparent.
If you are building sound absorbers, the greatest concern is not for fabric that is acoustically transparent, but you want to avoid fabric that is reflective. I've had very good results covering sound absorbers with fireproofed flannel, velvet and soft felt.
Most fabric is inherently sonically absorptive or transparent. More significantly fabric it is not always inherently fireproof. I have had extremely good results treating normal fabrics with commercial fabric fireproofing compounds.
We put washable fabrics into an ordinary washing machine, made sure it was wet down with the liquid fireproofing compound, and spun it out being careful to catch the liquid that was spun out for reuse. Once we finished treating the fabric, we put the washer through an ordinary wash cycle to rinse out the fireproofing compound. Fireproofing compound is usually made out of boron salts, some of which are used for washing clothes.
The fabric was totally fire resistant once treated and wouldn't even smoke a little when heated up over an open fire. The washing machine lived on for many productive years.