No idea, but I am using acoustic treatment , which is very effective. This is designed to provide excellent sound absorption while enhancing the decoration of any room. Designers are free to choose from a large variety of fashionable fabrics.
If you need unstable wall go here: movable walls Which provides sound reduction levels from Rw 30 dB to Rw 50 dB, where higher values represent the upper limit of Sound attenuation based on laboratory tests.
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