rockwool is going to bleed dust into your equipment. Go with accoustic foam panels, they are cheap even if you need to use some double sided tape.
It's going to be a challenge to soundproof without blocking off a lot of airflow.
this post was submitted on 24 Jul 2023
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I have full mesh front and rear doors, and the top is just a metal grate. I’m just going to focus on the removable side panels, just to minimize some echo.
That's not going to do much, then. Sound is transmitted through movement of air, so the mesh front and backs give the sound a direct path out of the rack. Close and insulate the front, back, and sides, and leave the top and bottom open for airflow. You can add insulated baffles to further reduce sound egress while still allowing airflow.
Using this method, I assume it would be beneficial to get some fans at the top to help with ventilation? Or would natural convection be enough?
Passive convection would probably be fine. You can add an extractor fan later if you find it's necessary.