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Semi Rigid Mineral Wool: layers?
Old 11th September 2012
  #1
Here for the gear
 
🎧 5 years
Semi Rigid Mineral Wool: layers?

I am constructing a very small vocal booth for voice overs. The approximate inside dimensions will be 38W x 72L x 80H. It will be a massive structure that should be pretty soundproof, but I need to treat it acoustically. I have decided on mineral wool and I can get it anywhere from 1" thick in 4lb to 4" thick in 8lb densities.

In playing with the numerous reverb calculators online they all give me different figures depending on which one I use and which material - sometimes relatively conflicting. It would seem that thicker is better and heavier is better, but not always.

Question: Would there be ANY advantage to layering, like putting say a 1" layer of 4lb over a 1 or 2" layer of 8lb? Given the small dimensions of the available space, the thickness does matter and I was thinking of possibly going 2" total thickness on one long wall, 3" on another and 4+" on the ceiling.

Am I over-thinking this, or can you guys offer any advice given my circumstances? I should be finishing construction some time next week.
Old 11th September 2012
  #2
Lives for gear
 
avare's Avatar
 
🎧 15 years
Quote:
Originally Posted by JCVO ➡️
I am constructing a very small vocal booth for voice overs. The approximate inside dimensions will be 38W x 72L x 80H. It will be a massive structure that should be pretty soundproof, but I need to treat it acoustically. I have decided on mineral wool and I can get it anywhere from 1" thick in 4lb to 4" thick in 8lb densities.

In playing with the numerous reverb calculators online they all give me different figures depending on which one I use and which material - sometimes relatively conflicting. It would seem that thicker is better and heavier is better, but not always.

Question: Would there be ANY advantage to layering, like putting say a 1" layer of 4lb over a 1 or 2" layer of 8lb? Given the small dimensions of the available space, the thickness does matter and I was thinking of possibly going 2" total thickness on one long wall, 3" on another and 4+" on the ceiling.

Am I over-thinking this, or can you guys offer any advice given my circumstances? I should be finishing construction some time next week.
There is no advantage to layering at random. At 4" thick, 6 lb/ft³ mineral wool is about the best you can use.

Andre
Old 11th September 2012
  #3
Gear Guru
 
Glenn Kuras's Avatar
 
🎧 15 years
Quote:
Am I over-thinking this, or can you guys offer any advice given my circumstances? I should be finishing construction some time next week.
You are over thinking it, but small rooms like that are not going to sound all that great. I highly recommend just treating the control room well and recording in there or use the live room, if you have one.
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