Not exactly sure how that compares, but I bought one of these quite hopefully: https://www.apc.com/us/en/product-range/203414049-netshelter... and "soundproof" means my home office doesn't sound like sitting on a subway train, and more like the inside of an airport.

I have one of these, they are quite effective.

Still a long way from what I'd call soundproof.

Indeed. But the equipment inside has fans and must move air around. The enclosure is most effective at high frequency noise and so what's left is much more tolerable (and reduced). I suppose you'd need to go to liquid cooled to do better? Or are you aware of a more effective enclosure?

> you'd need to go to liquid cooled to do better?

I'm afraid of trying something really invasive like liquid because I live in Portugal and getting weird stuff takes forever.

> Or are you aware of a more effective enclosure?

No I don't really: I have some heavy blankets hanging which helps a bit. My musician friend told me I should glue some egg cartons to the blankets, so I'm going to try that soon.