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Old 28th July 2019
Lives for gear

Acousticians will be able to advise with more authority and knowledge, but my guess is that at those frequencies you'll either be looking to build an external barrier like this :

or a similarly high-mass walled "room within a room", with added decoupling from the existing structure...via substantial springs (think car or truck leaf springs, or the heli-coil versions, that you see at the front wheel wells of cars).

Mass...and sprung/de-coupled...your best friends...and neither trivial nor cheap

Last edited by studer58; 28th July 2019 at 11:08 AM..