Originally Posted by tubetwister
Krab , can someone easily discern 0.2dB ? I was under the impression that the threshold was somewhat higher or no ?
I can't resist but to jump in. It depends on if the level change is:
- up or down [up is easier to hear, certainly for me at least]
- music, the kind of music, a sine wave test tone, random noise like pink noise, or the best signal is a narrow band of noise centered where the ear is both most sensitive to weak sounds and
small changes in sound, around 3.5kHz
- the dBSPL level you started the test at
- is it a steady state tone which changes or is it comparing two bursts with a time space between them?
- what's the frequency, Kenneth?
3dB = dead obvious
1dB = not a big difference but noticeable
.5 dB = only under good conditions like a lightning fast switch box that is held by the test subject so they know when to expect it.
.3 dB = some groups under ideal
conditions have been able to hear it
.2 dB = very sketchy, no consistent group can hear it and usually close enough to deem it "level matched" for casual testing, but if your gear can adjust it in tenths of a dB anyways, why not go for...
.1 dB = what you really should shoot for to be published but studies with much worse have been deemed "level matched"
Test your self with this 440 Hz tone [not a frequency where humans are very sensitive to small changes, by the way, so don't be surprised if .5dB is super hard or even impossible]: