On Tue, Jul 21, 2015 at 11:18 PM, Erling Westenvik <[email protected]> wrote: > On Tue, Jul 21, 2015 at 04:09:58PM +0100, Raf Czlonka wrote: >> On Tue, Jul 21, 2015 at 09:14:30AM BST, Karel Gardas wrote: >> >> > Following this: http://unixhq.com/websgt/sunblade150.pdf -- it's 5.5 >> > bells (is that 55 dB?). >> >> Yes - it's a standard SI prefix[0]. However, 'bel'(B), *not* 'bell', is >> not used very often and 'decibel'(dB) is the actual unit. > > The wonders of metric logic: a decimeter is one-tenth of a meter, but a > decibel is ten times a bel?
decibel is also one-tenth of bell, isn't it? Anyway, by different metic logic I've been more thinking about all those measurements on bystander position versus common position etc. See http://www.spectra.com/wp-content/uploads/coolthreadst1000.pdf -- and search for "noise". You will see: Declared Operating/Idling Acoustic Acoustic Noise 7.7B (LwAd,1B=10dB) 66dB (LpAm, bystander positions) -- this LwAd and LpAm is what I'm talking about here and what makes comparison of noise from Blade 100/150 and M3000 so difficult. Fortunately Christian give me this information from his first hand experience. Karel
