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RE: What makes a driver High Efficiency?

in a word: acceleration. Most high sensitivity drivers have very powerful magnets with low moving mass. The acceleration will translate to the amplitude of the sound wave. The driver doesn't have to move very much to be loud...even for bass (if loaded appropriately).

I have midbass drivers that are 99dB sensitivity and they almost never visually move. Think < 1mm excursion even with strong low frequency content. The magnet is 1.9 tesla and the moving mass only 7 grams.

A compression driver is even more extreme with magnet strength often > 2T and moving mass in the mg range. This means sensitivities in the 105-115dB range (with horn). Acceleration is extreme and therefore the smallest inputs yield high output.

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