This was compiled by myself with the following as resources:
My old notes
Turbosound Inc.
Hyperphysics.
Links to be provided
We often wonder what say 83dB/1w/1m/2.83V really SOUNDS like since I would venture to guess none of us listen to one speaker on-axis at 1m
*Note that these are general approximations since these are anechoic measurments that can be mitigated by room reverberations. Thankfully, we are dealing with short distances so they pretty much stay close.
We listen with stereo pairs so rule number one:
Add another 3dB to your Sensitivity rating. Say 90dB is now 93dB.
Now. Sound intensity reduces rapidly in intensity at a distance from the source according to the inverse square law, which predicts that a doubling of distance will result in a reduction of ΒΌ the original.
Important:Because SPL in dB is logarithmic that 1/4 doesnt mean your 100dB will be come a measly 75dB.
So lets pick a common sensitivity rating of 89dB 1w/1m
we use the Inverse Square Law (by ratio) calculator at http://hyperphysics.phy-astr.gsu.edu/hb ... ob.html#c3
We want to find out at 2 meters so plug in 2 (Double of 1 meter)
89+3 kasi stereo
Abracadabra!!! You get a shade under 86dB at your listening position.
Hope this helps you guys.