Finding sustainable acoustic cabinet fill

[TooDissing]

Description

When building a speaker cabinet it is important to limit any cabinet resonnances introduced by the drivers. This is mainly done by creating a sturdy cabinet and filling it with various acoustic foam materials. These work great, but are often oil based and not the most sustainable product available.

This is a small and sturdy cabinet, but there will likely be a need for some kind of damping. In the "old days" wool (yes from sheep) where used.

Within this task we need to source and test various sustainable alternatives to the modern "poly fill" material. Material goals:

• Sustainable
  • How does different products compare with each other an to no fill
  • and what about wool?
• Sourcing should be relatively easy - and possible for small businesses as well as individuals
• A material should improve the acoustical performance of the overall speaker compared to a cabinet without acoustic fill

Definition of Done

• [ ] Wool and other compatible materials have been tested and compared
• [ ] the selected material must be significantly better than no fill

Documentation

List of parts must be updated and the construction process as well.

[TooDissing]

We have seen good results with this type of material: https://www.visaton.de/en/products/accessories/cabinet-construction-accessories/damping-material 

[TooDissing]

Maybe this stuff could make sense: https://www.kvadrat.dk/en/really/products2/acoustic-textile-felt-fr

[TooDissing]

Have tested with wool filling in the latest version of the cabinet and it seems to perform well.

More tests need to be carried out (and other materials), should preferably be performed before we can close this issue.