1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.

    Dismiss Notice

Beyerdynamic Xelento Measurements

Discussion in 'Head-Fi Audio Measurement Lab' started by jude, Sep 12, 2018.
  1. Here is the frequency response measurement of the beyerdynamic Xelento compared to the Astell&Kern AKT8iE (the Xelento's semi-sibling (Fig.1):

    beyerdynamic-Xelento-and-Astell&Kern-AKT8iE_FR.jpg
    Fig.1 beyerdynamic Xelento frequency response, compared to the Astell&Kern AKT8iE

    (By the way, the measurements were made using the medium size Darth-Vader-helmet-looking silicone ear tips.)

    As you can see, this is very different from the measurement posted earlier (by someone else) in another thread.*

    Here are the THD measurements versus the AKT8iE (Fig.2):

    beyerdynamic-Xelento-and-Astell&Kern-AKT8iE_THD.jpg
    Fig.2 beyerdynamic Xelento total harmonic distortion (THD), compared to the Astell&Kern AKT8iE

    As you can see, the THD is very low for both of these models.


    The measurements included in this post were made on the same day using:


    * I suspect that the previously posted measurement did not mimic the input and transfer impedance of a human ear with an ear simulator/coupler -- an apparatus that connects the DUT (device under test) to a microphone in such a way that the working load on the DUT is the same as if used on a real ear [1]. Modeling the input impedance of the human ear becomes increasingly important the higher the acoustic output impedance of the DUT [1]. Also, the need for modeling the correct impedance increases with the proximity of the DUT to the ear [2]. It is for these reasons we use ear simulators for measuring headphones.

    I should also note that we are currently using a new GRAS High Resolution Ear Simulator (GRAS RA0401), released in 2017, with key improvements versus a standard IEC 60318-4 ear simulator. The standard IEC 60318-4 (former IEC 60711) ear simulator was designed in the early 1980's and mimics the input and transfer impedance of a human ear. While the input impedance was based on measurements on human subjects, the transfer impedance was based on the assumption that the ear canal is a simple cylindrical volume with a hard termination. The new GRAS High Resolution Ear Simulator still complies with the IEC 60318-4 tolerance band (which is specified up to 10 kHz), but with significantly improved performance above 10 kHz. From 10 kHz to 20 kHz the transfer impedance is within +/- 2.2 dB, resulting in much improved repeatability and more realistic THD measurements [3].

    We are also using a new, more human-like anthropometric measurement pinna by GRAS. The new pinna is based on 300+ 3D scans of human ear canals, designed to be closer to the human ear, with important changes to the pinna, concha and ear canal (versus previous measurement pinnae). You can see a short video about this here: GRAS Anthropometric Pinna

    You can find out more about the measurement lab at Head-Fi HQ at the following link: Head-Fi Audio Measurement Lab

    [1] Brüel, P. V., Frederiksen, E., Mathiasen, H., Rasmussen, G., and Sigh, E. (1976). "Investigations of a new insert earphone coupler," Part I in "Impedance of Real and Artificial Ears," Brüel and Kjær report.

    [2] Brüel & Kjær, "Measuring Human Audio Perception," presented at the 2018 ALMA International Symposium & Expo (AISE).

    [3] Wille, M. (2017). "High Resolution Ear Simulator," GRAS Sound & Vibration white paper.
     
  2. Peter Hyatt
    After an unfortunate accident w my beloved T8ie (first gen), I’ve opted for the Xelento
     

Share This Page