On December 14, 2018 at 10:04, Fred Harding said...
Osiris, actually, consider this. dB ratings are interesting. a change in 1 dB is barely perceptible. A change in 3 dB is noticeable. a 10 dB change is twice as loud. So a difference of 6 or 7 dB is significant in a quiet environment.
They're even more interesting than that.
You were doing great until you said "in a quiet environment." A quiet projector could easily add 6 dB to the overall SPL if the room is at, say, 45 dB. But if you were in a club with a band on stage, a 100 dB SPL sound might be required to increase the overall sound level by 6 dB. An increase of 6 dB is significant in ANY environment.
I think you were trying to get at the fact that it's surprising, in a quiet environment, how little sound is required to significantly raise the background SPL. But at this point I'm putting words in your mouth. Where were you trying to go with this?
