...but the sounds are still going THROUGH the wall. peopel with bass
dampeners on the wall stop the reflection of the bass inside the room,
but the sound is also still going through the wall.
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A properly engineered wall can essentially stop audible bass frequencies
from being heard just on the other side of the wall. The key to stopping
low frequencies is MASS. The more massive the wall, the better the low
frequency attenuation.
Novice sound engineers tend to concentrate on walls and miss the
importance of the ceiling, floor (if not sitting on a concrete foundation),
windows, doors, and air ducts.
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double drywall with insulation in between for home use is the best bet
most likely, with making sure everything is sealed properly around the
wall and the door.
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The least expensive soundproofing I've done has been to remove the
wallboard (a.k.a. -- sheetrock, gypsum board) from one side of a wall,
fill the void between the studs with small utility brick, and put new
wallboard back up in place of the old wallboard that was removed, then
tape and float as normal. The brick becomes the insulation.
For the ceiling, sheet lead is typically used in a professional
installation. Same goes for the walls.
If you want to go overboard just using wallboard, then use the so-called
water vapour resistant "greenboard," which is a wallboard that's commonly
used for some exterior soffit and fascia. It has a *lot* more mass for a
given thickness than regular wallboard.
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