Head-mounted measurement adds leakage absent from flat-plate fixtures

Evidence

Fixture 4 (KEMAR 45BC/KB5000) deviates furthest from Fixture 1 even though it shares the same coupler and pinna of Fixture 2. It has noticeably more leakage below 200 Hz dropping 10 dB below the reference, and an attenuated high-frequency response above 2 kHz. The leakage effects shown here are common to headphones measured on a head vs. a flat plate. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1732

Categorization

• XREF: Connects to measurement-fixture literature and headphone-testing standards the reader already follows.