Method for calculating loudspeaker parameters

Some parameters of a speaker can be calculated from other parameters. For speakers for which the manufacturers supply Fs, Qes and Vas, the calculated efficiency and the calculated sensitivity are displayed on the product page. This makes it possible to search / compare speakers following opposable criteria.
Here are the details of the methods used to make these calculations :

Efficiency = 9.6*10^-10*((Fs^3*Vas)/Qes) ---> with Fs in Hz and Vas in L.

Sensitivity = 10*log10(efficiency/(2*pi*10^-12)) ---> 1W in a half sphere, at 1m, with 10^-12 W/m² the sensitivity threshold of the human ear.

Source : "Direct-Radiator Loudspeaker System Analysis, RICHARD H. SMALL, June 1972"
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