- Thread Starter
- #21
Loose fibers = pink fluffy insulation
Compacted fibers = Corning OC-70x panels (commonly used to make absorbers), Rockwool, etc.
Solid fiberglass is used for car bodies, boats, musical instrument cases, etc.
Note an air gap can significantly increase absorption. At a boundary (e.g. wall, ceiling) velocity is ideally zero (and pressure is maximum). Since common absorbers work by converting sound "velocity" (kinetic energy) into heat (not enough to warm them up) they work better placed a little off the wall where the sound waves exhibit higher velocity. I have 2" soft foam blocks in the corners of mine to hold them away from the wall a bit.
That said, at the low fundamental mode in most rooms, absorbers won't do much unless you have a lot of (very thick) ones in the room.
FWIWFM - Don
Compacted fibers = Corning OC-70x panels (commonly used to make absorbers), Rockwool, etc.
Solid fiberglass is used for car bodies, boats, musical instrument cases, etc.
Note an air gap can significantly increase absorption. At a boundary (e.g. wall, ceiling) velocity is ideally zero (and pressure is maximum). Since common absorbers work by converting sound "velocity" (kinetic energy) into heat (not enough to warm them up) they work better placed a little off the wall where the sound waves exhibit higher velocity. I have 2" soft foam blocks in the corners of mine to hold them away from the wall a bit.
That said, at the low fundamental mode in most rooms, absorbers won't do much unless you have a lot of (very thick) ones in the room.
FWIWFM - Don