A 4” Air gap behind 6 or 8” is about 90% as effective as thicker fiber and costs less, but yours should be great!I got great results with fluffy fibre at 18" and the air gap is not so important at such low gas flows......so I've read!
A 4” Air gap behind 6 or 8” is about 90% as effective as thicker fiber and costs less, but yours should be great!I got great results with fluffy fibre at 18" and the air gap is not so important at such low gas flows......so I've read!
I don’t see how lightweight glass fibre would be an improvement on heavier Rockwool.
Correct, but when space is your enemy you use traps or tuned absorbers. Surface treatment would require soft depth of 0.75M on each side wall for across the room to be truly effective.An effective absorber matches to the impedance of air AND wavelength of sound. A 4" dense panel is better than 4" lightweight because it's impedance is better. But neither is deep enough in proportion to wavelengths of very low frequencies. Once you go 12"+ the impedance of the denser material is far too high and it becomes reflective, the lighter material is then far superior.
Likely ply - as long as it’s thin. 18mm ply would be too heavy I would think.also the panel absorber doesnt explain what material the thin panel is?
You’ll be better off by positioning the speakers first as high pressure points may shift - you may not notice it at the seating position but the antinodes will move with speaker pointing/placement and they’re what you’re trying to find.i do still need to setup my monitors at correct degrees (60degrees) and position them correctly in the room as it makes a pretty big difference in the plots but that said these frequencies still seem to be the problem whereever i move them, so to me moving the speakers could be done once i have started to notice a difference in removing the nulls.
I put a link in an earlier post on a calculator for these. Here it is again. They’re easy to make - you just have to fiddle with the calc to get a practical solution.could i make a helmholtz for the 120hz and the 83hz?
would this possibly be a good option?
and again would i just place it at the high pressure zone (loudest) point of where i hear those frequencies?
Material can be wood, plastic, metal, really anything that is flexible. Wood is the easiest to work with. You could also make a membrane absorber where the front is mass-loaded vinyl, but it’s a little trickier to get it right.also the panel absorber doesnt explain what material the thin panel is?
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