[jude]

Fig.1 (above): Sennheiser HD650 frequency response, average of four seatings.

NOTE: When these measurements were made, the Sennheiser HD650 under test had only been worn by measurement fixtures, so the earpads were in new condition.

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The measurements in this post were made using:

• Brüel & Kjær High-frequency Head and Torso Simulator (HATS) Type 5128
• Audio Precision APx555 Audio Analyzer (with Bluetooth Duo Module)
• Audio Precision APx1701 Transducer Test Interface
• Herzan custom-designed acoustic & vibration isolation enclosure

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[ADUHF]

Interesting that there is still a strong primary resonance at around 3k, not unlike with the older 711 measurement systems.

It might be interesting to see some diffuse field plots with the 5128 system as well.