sound isolation

[bert stoltenborg]

When you consult Gearspace and other reliable sources you will see that the good people there (some worked on projects that still exist) strongly advise against trying to reduce sound with a music spectrum with a lightweight construction.

"Per above, that is bad advice. Lightweight construction is your friend when it comes to bass absorption. Using it in a room within a room is very effective on both fronts (absorption and isolation).
As for GS, there are plenty of myths taken as reality there. There is no substitute for real knowledge."

You really should be ashamed of yourself, Amir.