iFi Pro iESL Electrostatic Headphone Energizer Review

Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by Marvey, Jun 5, 2021.

  1. Marvey

    Marvey Super Friend

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    This will be the last set of measurements. Earlier with a low-gain and low-power amp, my custom Eddie Current 45, we discovered that the iESL performed best on the 16-ohm x32 gain setting. Now what happens when we use a high-gain high-power speaker amp like the Vidar?

    We know that transformers saturate when the signal level gets higher. We also know that the sweet spot for power amps with respect to noise and maybe distortion is usually more than a few Vrms. Let's explore the different gain / impedance settings using the ESP950 - also keeping in mind the limitations of the ESP950.

    Vidar --> iESL --> ESP95X
    Distortion @ 16-ohm setting
    upload_2021-6-15_21-24-49.png

    Vidar --> iESL --> ESP95X
    Distortion @ 32-ohm setting
    upload_2021-6-15_21-25-27.png

    Vidar --> iESL --> ESP95X
    Distortion @ 64-ohm setting
    upload_2021-6-15_21-25-53.png

    Vidar --> iESL --> ESP95X
    Distortion @ 96-ohm setting
    upload_2021-6-15_21-28-27.png

    From this, it would appear that for high-gain high power amps, the setting for the lowest distortion would be the 96-ohm.
     
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  2. iFi audio

    iFi audio MOT iFi Audio

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    Great findings @Marv, thanks a ton!
     
  3. Armaegis

    Armaegis Friend

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  4. iFi audio

    iFi audio MOT iFi Audio

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