Mass Loaded vinyl Barrier Roxul stone wool insulation
Boat Engine Room sound insulation
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STC
What can be heard
25
Normal speech can be understood quite easily and distinctly through wall
30
Loud speech can be understood fairly well, normal speech heard but not understood
35
Loud speech audible but not intelligible
40
Onset of "privacy"
42
Loud speech audible as a murmur
45
Loud speech not audible; 90% of statistical population not annoyed
50
Very loud sounds such as musical instruments or a stereo can be faintly heard; 99% of population not annoyed.
60+
Superior soundproofing; most sounds inaudible
The use of mass loaded vinyl will attenuate frequencies that will not be controlled by wall treatments.
The demanding reference standard (a guideline for high-quality audio in movie soundtracks) requires partitions to achieve 50dB of attenuation at 63 Hz.
If an 80dB sound on one side of a wall/floor/ceiling is reduced to 50dB on the other side, that partition is said to have an STC of 30
wall with an STC of 30 may provide over 40dB of attenuation at 3000 Hz but only 10dB of attenuation at 125 Hz
The "Noise Reduction Coefficient" (NRC) is a measure of how much sound is absorbed by a particular material, and is derived from the measured Sound Absorption Coefficients