Quote from Nick in The Captain
Jess: I love it. Nick: Yeah. Jess: I don't- I don't know what it is. Nick: All right, then yell something. [Jess yells] I soundproofed it. Winston: [enters] What's wrong? I just heard yelling. Nick: Get out of here, man. [Winston exits] He must- He must've literally been right by the door. It is soundproofed. That's what the egg crates are for.