Walls in apartments are usually drywall, block or glass, all of which reflect almost all of the sound that reaches them. Residential occupancy; condo boards often restrict drilling into party walls and ceilings, so check your bylaws.
Treat reflection points first
A reflection point is a spot on a wall where sound from a source bounces to a listener. You can find them with a mirror: sit where people listen, have someone slide a mirror along the wall, and mark each spot where you can see a sound source. Panels there give the biggest improvement per square foot.
Parallel walls and flutter echo
Two bare parallel walls make a fast, buzzing echo when you clap. One panel on each wall, offset from each other, usually stops it. See flutter echo between drywall walls.
Recommended wall products
- Essential: Offices, living rooms, classrooms, from $69
- Arc: Restaurants, hospitality, living rooms, from $86
- Orbit: Feature walls, lobbies, kids' rooms, from $50
If the wall needs to block sound too
Panels do not add meaningful STC to a wall. If sound coming through the wall is a problem, read soundproofing and STC for apartments and what STC means.