Thanks for great info from all of you.
Quote:
Originally Posted by Tyll Hertsens
Good question!
The big hump is the free air resonance of the driver.
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So,that "acoustic optimizer" in the AH-D7000 that Denon claims is supposed to equalize sound pressure levels on both sides of the driver...perhaps that is responsible for eliminating the impedance hump? I wonder at the mechanism.