/vr/ - Retro Games

Quake bros, I'm having a weird issue with my Malice map. Everything seems to be VIS'd correctly, but I'm having some pretty significant audio bleedthrough of ambient noises and monster idle sounds everywhere. Is there anything I can do about this?
In pic related for instance, the scuba guy and fan turbine are both perfectly audible in the room below despite multiple walls separating them. Standing in that room with 'r_showtris 1' on confirms that the other areas are VIS'd out. I was under the impression that this should be sufficient to block sound, but maybe I'm just having a retard moment.