To have activities going on, on both sides, at the same time.
NRC (Noise Reduction Coefficient) – used to measure noise reduction (through absorption) in the same space as the noise source. It is basically a measurement of how well something absorbs sound, mostly in the range of normal speech frequencies. It is measured from 0 – 1.0 and can be thought of as a percentage. The higher the NRC, the better it is at absorbing sound.
Example: A painted drywall wall has NRC of about .05, so it absorbs only about 5% of the sound that hits it and reflects back 95% of the sound.
STC (Sound Transmission Class) – A rating of how well a material/product attenuates sound. In simpler terms, it is how well an item blocks sound from going through it. The higher the STC rating, the better sound isolation the wall will achieve. The STC rating is derived by measuring the transmission loss in dB at certain frequencies and comparing it to a known STC curve.
Example: A metal stud wall with ½ in. thick drywall has an STC of 34. Cinder Block walls have an average STC of upper 40’s to low 50’s.
An STC rating in the upper 40’s is good. STC ratings in the 50’s are excellent.
Decibel (dB) is a logarithmic scaled unit of measurement. It is quite often used to define an intensity of a sound level or the power of an electrical signal. The dB scale is a easy way to define numbers that are normally very small to very large. When describing sound level in dB, the term dB SPL is used. (Sound Pressure Level) Humans perceived SPL changes as a perceived loudness. This is a scale where 0 dB SPL is the lowest level sound audible to humans and 125 dB is the threshold of pain. The dB scale is logarithmic, meaning that a 10 dB increase means we perceive the sound level as twice as loud. A 10 dB decrease means that the sound level is perceived as half as loud. A 3 dB change in level is considered a just noticeable change in perceived loudness.
Putting an exact number on decibel reduction by placing our Acoustic Curtain / Panels for a particular space is difficult.
There are many variables to consider: