What Is Acoustic Value

The STC is a measure of the noise reduction of a construction or material when measured over the human hearing range of 125 to 4000 cycles per second.

What's a good STC rating?

STC rating of 38-42 is considered good soundproofing for residential. STC rating of 50-65 is professional, commercial soundproofing for recording studios, etc. These terms and definitions are related to Sound Transmission Class and will help provide the full picture of how sound is measured. dBa – A-weighted decibels.

Is a high STC rating better?

Higher STC ratings generally are better. … This means that extremely low frequencies don’t register on the STC rating scale, thus when a sound on one side of a wall is below 125Hz, the ability of the wall to block sound cannot be calculated. STC is not a direct measure of how many decibels of sound a wall can stop.