So here's a great video with Tyll talking to Paul Barton (a great guy who's been around audio for 46+ years with PSB) with regards to measurements, dummy heads AND how they regard to the Z1R:
https://www.innerfidelity.com/content/canjam-rmaf2017-people-i-love-paul-barton
Makes sense why several of us never heard a peak, or why Jude didn't measure one. Most heads have "curved" ear canals as did Jude's dummy head...but Tyll mentions his is a straight cylinder. Paul mentioned that he thought that a peak measured at 9kHz ish likely wasn't there, but the straight cylinder might have had a cause. At least we have a plausible reason for this issue.
https://www.innerfidelity.com/content/canjam-rmaf2017-people-i-love-paul-barton
Makes sense why several of us never heard a peak, or why Jude didn't measure one. Most heads have "curved" ear canals as did Jude's dummy head...but Tyll mentions his is a straight cylinder. Paul mentioned that he thought that a peak measured at 9kHz ish likely wasn't there, but the straight cylinder might have had a cause. At least we have a plausible reason for this issue.
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