More acoustic element models:
https://3dsky.org/collection/shared/5390990 

Sound absorbing ceiling module from Hey Sign
Felt color is easily customizable in Corona Color or Vray Color

Product on the manufacturer's website:
https://hey-sign-shop.de/Acoustics/Wandelements/Wandelement-Loop/1203745 

3dsmax 2013 file and FBX with Vray materials
3dsmax 2013 file and FBX with Corona materials
Preview materials Corona
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All CoronaLegacyMtl materials compatible with Corona versions from 1.5

For Vray versions below 3.1, some materials may not show up in MatEditor and when rendering. To fix this, set the Blinn value in the BRDF section.