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Confidence votes 4.9K. No, 10 dB is perceived to be twice as loud, and requires 10 times the power. Doubling of the volume (loudness) should be perceived by a level difference of 10 dB â psychoacousticians say.Doubling the sound pressure (voltage) level corresponds to a measured level change of 6 dB.Doubling of acoustic power (sound intensity) level corresponds to a calculated level change of 3 dB.4 decibels is about as loud as sitting 8 to 10 feet away from stereo speakers. 74 decibels is almost the same as the sound of a washing machine it is just 1 decibel higher.
Best Answer: dBA = decibels..how loud it it is. Decibel is a logarithmic scale of sound. Higher dBA is louder. http://en.wikipedia.org/wiki/Decibel http://www.gcaudio.com/resources/howtos/... RPM = revolutions per minute, speed of fan..how fast the blades are turning.Note the faster it turns the higher pitch the sound will be.It will typically be louder/more noticeable when talking of fans.http://en.wikipedia.org/wiki/Revolutions...CFM = cubic feet per minute, how much air it is moving.PM = revolutions per minute, speed of fan..how fast the blades are turning. Note the faster it turns the higher pitch the sound will be. It will typically be louder/more noticeable when talking of fans. http://en.wikipedia.org/wiki/Revolutions... CFM = cubic feet per minute, how much air it is moving.