Seeking clarification of noob level questions.

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Hi,

Power sensitivity as a concept is almost useless, IMO its far better
to stick to voltage sensitivity and acknowledge the related impedance.
Nearly always actually the voltage sensitivity of a loudspeaker.

Efficiency % and dB / real watts are variations of the same number.
Again does not tell you much without knowing the impedance.

I'll repeat again the 3dB increase is due to improve acoustic
impedance matching. The air load is shared between the
drivers, each driver sees a higher acoustic impedance.
4 drivers wired series / parallel are +6dB, 9 drivers +9.5dB,
16 drivers +12 dB etc (10log(n)dB) at coupled wavelengths.
Again this is why small drivers are less efficient than large ones,
a large driver can be considered to be a number of smaller drivers.

:)/sreten.
 
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