Renovating rooms to absorb sound may seem ambitious, but the results can be rewarding, especially if you’re investing in an entertainment room for movies, music and video games, or trying to contain the sounds of your kids’ social activities. The most effective approaches are installed at the building stage, as some of the best sound-deadening materials are designed to be applied within the walls, floors and ceilings, rather than on their inside-facing surfaces. In cases where you wish to retrofit a room’s existing interior, there are various types of rigid panels and baffles, as well as soft fabrics and foams that can make an impressive contribution to your peace and quiet.