Acoustically transparent headphones are an important tool for Augmented Reality (AR) research. To supplement a real acoustic scene with virtual sound sources or virtual acoustics, previous studies have used the very open AKG K1000. Since this model was discontinued and is expensive on the second-hand market, we present modifications to a regular open headphone. Measurements show that cutting out pieces of the ear-pads can yield transparency characteristics comparable to the K1000. Fully surrounding transparency measurements of the original and the modified models are presented. Moreover, based on headphone transfer function measurements, minimum-phase filters are derived, to compensate for the loss of low frequencies after modification. The instructions and open measurement data make it easy to replicate this DIY solution.

Authors: Meyer-Kahlen, Nils; Rudrich, Daniel; Brandner, Manuel:; Wirler, Stefan; Windtner, Simon; Frank, Matthias
Affiliations: Aalto Acoustics Lab, Department for Signal Processing and Acoustics, Aalto University, Espoo, Finland; Institute of Electronic Music and Acoustics, University of Music and Performing Arts, Graz, Austria(See document for exact affiliation information.)
AES Convention: 148 (May 2020) eBrief:603
Publication Date: May 28, 2020
Subject: Loudspeakers & Microphones

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