It's sound insulation material yes, 2cm of some kind of mineral wool. The shiny coating is actually non conductive and made of some sort of plastic, maybe it has an additional effect or is there to avoid direct skin contact to the mineral wool, I don't know. What I do know is it helps noticably in keeping the noise low and the insulation + rubber grommets under the HDs make them almost silent under operation.
Thanks, I could probably have made it even cleaner with power tools but I'm pretty satisfied with the current result![]()




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