08-21-14: SebrofOK. so you've made my point again: distance from the speaker is important - there's a very specific distance from the speaker they are listening from & measuring the SPL from.
08-21-14: Bombaywalla
If you take 1 step closer to the speaker, the SPL will go up. If you take 1 step back, the SPL will go down. If you raise yourself 1 foot off the floor, the SPL will change Distance from the speaker matters.....
I believe the point of the other posters is that they give the db reading where they listen, and one step closer, one step further away, one foot off the floor are pretty much irrelevant because they don't listen from there.
Most think of SPL as a number - 90dB, 95dB, 105dB, etc, etc but it's a number with a distance associated with it.
Look at a speaker spec: For example: 90dB/W/m. Correct?
you've seen such a spec before, right?
how do you read this spec?
90dB SPL feeding 1W into 8 Ohms (not written but assumed to be the industry standard) & listening at 1m away.
dB SPL with a distance attached to it......