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I'm very confused about how sensitivity and impedance affect efficiency.

I upgraded my Shure E2c to a RE0. The Shure E2c has a sensitivity of 105dB and impedance of 16ohm.

The RE0 has a sensitivity of 100dB and impedance of 64ohm.

Correct me if I'm wrong.

The RE0 is 5dB less efficient right off the bat from sensitivity. I believe as impedance goes up, the efficiency drops. 16 ohm to 64 ohms is 4 times the impedance, which translates to 12dB drop in efficiency. So technically the RE0 is 17dB less efficient than my E2c. But actually I feel the RE0 is even more efficient that my E2c. How is that possible?