I used something like this one:
20mm thick..
Glued it with spray glue and i can say - it works perfect Allmost no noise
M20 Rubber Sheets
M20 Rubber sheets as an acoustic mat designed to be installed as part of an acoustic wall lining. The product allows a good level of airborne sound reduction without losing significant depth on the room where the product is installed.
www.soundinsulationstore.co.uk
20mm thick..
Glued it with spray glue and i can say - it works perfect Allmost no noise
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