Sometimes, a single room isn’t quiet enough, and you need to go deeper. “Room within a room” construction is the gold-standard for soundproofing, and is regularly used by those who are serious about reducing noise. Not only do these rooms need heavy walls and insulated glass to block noise in the air, they also need to be isolated from any noise that might be moving through the walls or the ground. This noise (sometimes called structure-borne sound) carries extremely well, and bypasses any absorbing insulation that might be present in the walls. To avoid this, sound isolation booths, anechoic chambers, and other room-within-a-room constructions use “floating floors,” floors suspended entirely on springs or rubber. When done correctly, sound has no easy path in or out, greatly reducing both the noise within the booth and the sounds that escape it. (Photo credit MetalWorks Studios)