Acoustic Knowledge

The speed of sound is the rate at which a sound wave travels through a medium. In air at 20°C (68°F), it is approximately 343

Reverberation time is the time required for sound in an enclosure to decay by 60 decibels after the source stops. It is expressed in seconds

Noise Criterion (NC) is a single-number method for evaluating relatively steady background noise in an indoor space from its frequency spectrum. Engineers compare measured or

When comparing WPC wall panels vs PVC wall panels for a bathroom or another humid space, PVC is usually the safer starting point for areas

The difference between NRC vs STC is simple but important: NRC describes sound absorption within a room, while STC describes resistance to airborne sound passing

What is a decibel? A decibel (dB) is a logarithmic way of expressing the ratio between a measured quantity and a reference quantity. In airborne

What is Hertz in acoustics? Hertz (Hz) is the SI unit of frequency. One hertz means that a periodic event repeats once per second. For

αw (Alpha-w) is the weighted sound absorption coefficient defined by ISO 11654. It condenses frequency-dependent laboratory absorption data into one value, normally reported in 0.05

A Noise Reduction Coefficient (NRC) rating is a convenient single-number summary of how much sound an acoustic material absorbs at four mid-frequency octave bands. It

Hotel acoustics should begin with the type of noise problem—not with a product catalogue. Noise passing between guest rooms or through floors usually requires sound