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General speaker questions for audio and home theater.

You might want to review that...

Your opening sentence ("Sensitivity is, and always has been, expressed in 1W/1m.") is incorrect.

Sensitivity is in fact 2.83Volts at one meter.

In every other way your post is correct.

Efficiency as a measurement standard went out some years ago (1980s), to be replaced by sensitivity. But you still see it used all over the industry. There is continuing confusion on the topic.

The history of it goes back to the 1950s, when EV and MacIntosh began to push for a voltage source amplifier standard. Prior to that time, all speakers had to have level controls for the midrange and tweeter as the actual voltage response of the amplifier to be used was unknown (IOW they were not there to adjust to the room). By adopting a voltage source as a reference, the controls could be eliminated. But the older efficiency standard held on well into the 1980s and is still used today.

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