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Original Message
As JA himself has pointed out in speaker reviews...
Posted by Ladok on May 28, 2017 at 15:15:50:
...sensitivity doesn't tell the whole story. The speaker's impedance has a lot to say about the actual "sensitivity." The Supreme is 16 ohms and will draw less power from the amp to achieve the same db level as a 4 or 8-ohm speaker. So using that standard, it's actually more sensitive than 91 db. This has also come up in reviews of Devore speakers, which under JAs test conditions don't meet their sensitivity spec but have 12-ohm impedance so are actually more sensitive than the test indicates.