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Originally Posted by NLP  So, just air without mineral wool is even better  |
50 m air with just a cloth over it could be an interesting test and should be amazingly good indeed according to the ZORBA software.
Or, to put it even more to an extreme, use a tent outside. I have heard this is not a bad alternative for some projects.
Actually 'heavier is always better' is not true but 'lighter is always better' is also not true. What should be true is this: For every given absorber thickness and air gap combination there is an optimal flow resistance.