Is the loudness of sound cumulative? - AnandTech Forums
Mar 17, 2009 · A 20 dB sound has a 10 Pa * 10^(20dB/10dB) = 1000 Pa pressure. Two 20 dB sounds have a 2*1000 Pa pressure. Converting this back to decibels, the sound is log (2000 Pa / 10 Pa)*10 dB = 23.01 dB. Yes, loudness of sound is cumulative. But the artificial decibel rating given to sound isn't directly additive.
How loud is 33 dBa? - AnandTech Forums
Jun 1, 2002 · Perceived sound is on a log(10) scale, meaning a 10dB increase is perceived as twice as loud as before. If you really, really want to know how one sound will add up with another, you have to convert the dB rating into Sound Pressure Level or …
How loud is 39 dba? - AnandTech Forums
Sep 19, 2002 · Under the decibel scale, when the sound level increases by 3 dB, the actual sound energy doubles. This means that half of the sound energy must be eliminated to reduce the sound level by 3 dB. With a 6 dB increase, sound quadruples. The ear does not perceive changes in the sound level in the same degree that sound energy increases.
Are Decibels Additive? - AnandTech Forums
Apr 17, 2003 · Sound pressure levels, for example, cannot be added together as can kilograms. The combination of two noises with average levels of 60 dB does not give a sound pressure level of 120 dB, but 63 dB. The addition of a noise with a level of 70 dB to a room with a level of 80 dB will result in no measureable difference in the overall level.
Understanding actual meaning of dBa fans produce
Jul 25, 2001 · First, let me clarify that there is a dramatic difference between dB and dBa.Overall dB sound pressure level ("loudness") is the logrithmic sum of the sound pressure levels at a set number of discrete frequencies, usually 32Hz, 62.5Hz, 125Hz, 250Hz, 500Hz, 1KHz, 2KHz, 4Khz, 8KHz, and 16Khz.
How "loud" is your fan in a closed case? @30db, @40db, …
Dec 22, 1999 · It depends what kind of case, what you consider "loud" etc. Physics wise, every 3 db is a theoretical doubling in noise output. The human ear generally preceives 7-10db as double the noise out put. It also depends at what frequency.
How much of a difference is 16dB? - AnandTech Forums
Mar 28, 2003 · Originally posted by: silverpig. Every increase in 10 dB = 2x the sound energy. NO! In sound pressure and other power measurements, 3 db is a doubling of power. The forumula is 10 log (multiplier). In linear measurements, such as voltage, 6 dB is a doubling of amplitude. The forumula is 20 log (multiplier). J.
How much louder is 110db vs. 90db? - AnandTech Forums
Aug 18, 2016. #12. Eug said: It's 20 dB louder. It's a doubling every 3 dB, so around 100X the sound power. You won't perceive that as 100X though. Some people say that it sounds like 4X as loud but I'd guess that'd vary. I guess to put it another way: +3 dB seems a little bit louder to us humans, but it takes twice the power to achieve that.
Is a 31 dba case fan noisy? Need some advice here!!! - AnandTech …
Aug 2, 2001 · If the energy level is 10, the dB measure is 10 dB If the energy level is 20, the dB measure is 13 dB If the energy level is 100, the dB measure is 30 dB So, 20 dB is not twice as loud as 10 dB. Because a logarithmic scale is used, every 3 dB increase in sound level doubles the perceived sound level for humans. taken from here.
Is 43 dBA loud? - AnandTech Forums
Aug 13, 2002 · Sep 29, 2000. 3,100. 0. 76. Aug 13, 2002. #2. 43 dBA is pretty loud; by comparison the 120mm Panaflo is only 30 dBA. But, since it's a 120mm at least it won't be a high pitched whine like high speed 60mm fans. P.