Pat Farrell wrote: > Robin Bowes wrote: >> Actually, a 3dB increase represents a doubling of the sound power, which >> is not the same as "volume". > > Which is why the power version uses a 20 log (x/y) and the > normal definition uses 10 log(x/y)
No, it's the other way round. Pressure levels use 20log(p/p0), power levels use 10log(w/w0) > >> It is generally accepted that a perceived doubling of loudness equates >> to approximately a 10dB increase, i.e. 10 times the power. > > Hmmm, I may be mis-remembering things, I thought 6dB required ten times > the amp power. Thus a 100wPC amp is not significantly louder than a > 60wPC amp. Well, the thrust of your point is correct - dB levels are not the same as amp power. However, when I use the term "power" above, I am not talking about amp power levels. >> Anyeway, a 3dB change is not what I'd call a "barely perceptible change >> in loudness". > > The usual definition of one dB is smallest reliably detected change in > loudness. Er, I've not heard that definition before. It's certainly true, i.e. 1dB is about the smallest reliably detectable change in loundness, but a dB is not defined as that. R. _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
