Sulate air and contact sounds
Instruments can emit both airborne and impact noise. A piano spreads both types of sound, just like an acoustic drum kit, while wind instruments, such as a saxophone, spread only airborne sound (sounds). The two different ways of isolating are explained below.
Air sound is the sound produced by a sound source, for example voice or the sound of a gong. Isolating airborne noise is done by packing the source as much as possible. A room-in-a-room principle is the best way to keep airborne noise within a room. An example of room-in-a-room is a studio cabin or the use of secondary walls.
Contact sound is transmitted through the construction in the form of vibrations, resonances in certain frequencies. The sound source makes direct contact with a floor or wall and sets them in motion. These constructions then convert the vibrations and resonances into airborne noise. Important: contact noise is often more emphatically present than airborne noise and should be tackled as much as possible at the source itself. The acoustic isolation of contact sound is usually done by placing vibration insulation such as Regufoam, Regupol or Agglomer. Vibration-insulating material disconnects the sound source from the subsurface so that hardly any energy can be transferred.