Make a note of what setting your receiver/preamp was at when it achieved that volume (using an SPL meter to measure the volume in your seating position). Thus, many calibration disks have their test tones recorded at 75db or 85db (30 or 20 db "down" is what it's referred to as) so that when you calibrate you don't melt your ears. If you are referring to Home Theater, it means setting the volume at a level which will enable the system to reproduce the volumes to the maximum level dictated by the audio format in use.įor example, Dolby Digital specifies 105db as the maximum (with 115db, I believe, for the subwoofer). Sound Pressure Level - OSHA A-Weighted per Day - OSHA maximum A-weighted sound pressure levels allowed per day.Depends on the context it is in, I believe.Sound - L s - Exposure Level - The EPA Sound Exposure Level - L s - describes the noise from a variable source.Sound - L dn - Day and Night Level - The EPA A-weighted sound level day and night equivalent definition - L dn - for a 24 hour period.Noise - Recommended Exposure Limits (REL) - The NIOSH noise Recommended Exposure Limit - REL - for occupational noise.Noise - EPA Protective Levels - The noise level should not exceed certain values to protect public health and welfare.Noise - Acceptable dB A Level - Acceptable noise - dB A - level at typical common locations.NC - the Noise Criterion - Noise Criterion - NC - level is a standard uesd to describe the relative loudness of a space within a range of frequencies.Decibel A, B and C - Sound pressure filters that compensates for the hearing sensed by the human ear.Acoustics - Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.Use the calculator below to calculate equivalent sound level: The equivalent sound level for one hour running can alternatively be calculated with (2) as The equivalent sound level for one hour running can be calculated as The equivalent sound level for half an hour working can be calculated as The equivalent sound level for half an hour idling can be calculated as L eg_total = total equivalent sound level (dB) Example - Equivalent Sound LevelĪ machine generates a sound pressure of 0.02 Pa half the time when idling and 0.1 Pa the other half of the time when working. P ref = reference sound pressure ( 2 10 -5 Pa, N/m 2)Įquivalent sound levels can be added together as This descriptor correlates well with the effects of noise on people.Įquivalent Sound Level - L eq - can be calculated by integrating the sound pressure level over a time period as: L eq is also sometimes known as Average Sound Level - L AT even if this is not. It is designed to represent a varying sound source over a given time as a single number. Equivalent Sound Level - L eqĮquivalent Sound Level - L eq - quantifies the noise environment to a single value of sound level for any desired duration. To summarize how sound is heard and measured, and to determine the impact of noise on health and welfare. The Environmental Protection Agency - EPA - has adopted a system of four "sound descriptors"
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