Just for the sake of conversation - What is the correct 'simple number'?
My experience playing with Art's keystone project has me GAS'ing hard for the real deal.
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Just "being picky" it is the number that YOU come up with using the provided freq response graph-both in sensitivity and freq response.
Different people can look at the same graph and come up with different "simple numbers".
That is EXACTLY the reason we provide the actual response graphs provided by the measurement system (not something "redrawn" for a spec sheet)-so people don't have to guess as to where the "simple numbers" may have come from.
If you don't have the actual response graph-WITH associated SPL number (NO, 0dB on the scale DOES NOT count-unless the 0dB is defined and associated with a specific dB SPL), then you have no idea where they came from.
For example-If the sensitivity number is increased (which it could "still be correct") then the low freq corner would ALSO have to increase.
IF the low freq is DIRECTLY tied to the SPL number. That is THE ONLY LEGIT WAY to do it.
If you don't "tie them together" then you can simply "make up" whatever number you want-and they don't have to mean anything.
For example we could state the sensitivity as 114dB (which IS noted on the spec sheet), since the speaker WILL produce this level with 2.83V input.
But that is not real useful when looking at sub freq. But most manufacturers that only give "simple numbers" do not say where they come from.
One VERY FAMOUS manufacturer actually rated one of their 2x18" subs having a "20-20K sensitivity" at the level that was produced around 1800Hz. Not exactly in the sub range-but still in the "audio freq range"-so for some people this "counts".
So the real answer is "it depends". Sorry.