Ceiling Attenuation Class (CAC)
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Ceiling Attenuation Class (CAC) - Rates a ceiling's efficiency as a barrier to airborne sound transmission between adjacent closed offices. Shown as a minimum value, previously expressed as CSTC (Ceiling Sound Transmission Class). A single-figure rating derived from the normalized ceiling attenuation values.
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Cancellation
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Cancellation - The destructive interference of two or more sound waves. Waves of similar frequencies and amplitude, but of opposite phase (180°F) produce mutual cancellation effects.
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Bright
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Bright - Listening term that usually refers to excessive upper frequency (treble) energy.
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Break
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Break - A physical gap in the assembly or construction, which acts to decouple sound vibrations from traveling through a structure.
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Boomy
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Boomy / Boominess - Listening term that usually refers to an excessive amount of low frequency (bass) energy.
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Block
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Block - To reduce airborne sound transmission.
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Bass Trap
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Bass Trap - A low frequency absorber. Low frequencies are particularly difficult to absorb due to their long wavelengths. Bass traps are designed and constructed to absorb these longer Wavesand control unwanted room resonances. Broadband absorbers extending to lower frequencies are often called Bass Traps, imprecisely.
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Barrier
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Barrier - Heavy, dense and massive material used to block sound.
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Baffle
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Baffle - A device used to inhibit the propagation of sound waves. Baffles are usually suspended vertically from ceiling to reduce reverberation time.
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Background noise
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Background noise - The ambient noise level above which signals must be presented or noise sources measured.
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