The
Marpac SleepMate and
Sound Screen 980 white noise machine operate at approx. 60 dB, the same as a normal conversation. Customers often ask if a
white noise machine contributes to hearing loss in babies, children and adults. Hearing loss may be caused by a one-time exposure to an extremely loud soud (such as an explosion) or by exposure to loud sounds over months or years. Loudness, or sound intensity, is measured in decibels (dB). The scale runs from O dB (which is the faintest sound a human ear can detect) to more than 180dB (the noise at a rocket pad during launch). Decibels are measured on a logarithmic scale, meaning that every time the intensity increases by units of 10, each increase is 10 times the lower figure. So 40 decibels is 1000 times as intense as 10 dB.
