How are decibel levels calculated on generators?
A. Most generator manufactures, but not all, calculate dBA levels at full load operation. The USA standard is based on the sound level at 21 feet (7 meters) and the European standard is based on the sound level at 23 feet but its close enough to compare. The calculation of dBA levels involves a complicated mathematical formula. The relative noise level is the best way to understand the relationship of one sound to another. Human conversation is 60 dBA. below are typical descriptions of sound levels. Take all sound levels provided by manufactures with a grain of salt. You cant tell the difference in 5 dBA without a lot of experience and a sound meter. See our noise table at NOISE. Industrial Quiet well designed enclosure with air-scoop and dense foam. 69 to 75 dBA – noticeable noise level at 10-feet / loud conversation at 21-feet. Residential Quiet well designed enclosure with air-scoops and foam. 64 to 68 dBA – quiet but noticeable at 10-feet / normal conversation at 21-feet. Super Qui
