Isolation can be defined as the degree of acoustical separation between two locations,
especially adjacent rooms. When dealing with sound isolation you must consider
that only two things stop sound - mass and space. You need mass to contain the
airborne sound, and you need space (an air gap or similar unobstructed area) so
that the structure borne sound cannot be transmitted.
Structural born noise
is often the hardest to deal with. You need a high mass and an air space as mentioned
above so that there is no positive structural contact. For example, in the case
of a hard floor above the listening environment you would need to decouple the
floor joists from the ceiling joists. The most common and effective way to do
this is to use resilient sound Isolation clip.