iFi Audio Pro iESL - The Official Thread

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  1. iFi audio
    Thanks for letting us know. And yes, our support is the best way to handle any issues along the road.
     
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  2. analogsurviver
    I assume you are talking about the hum perceived when you drive the Pro iESL from an amp trough speaker terminals.

    Yes, this is one serious omission on the part of the iFi - when driving the Pro iESL via speaker terminals, there is NO grounding/earthing provided; the lack of ground/earth results - as in your case, best scenario - in hum when the amplifier driving the Pro iESL has linear power supply; when the power supply of the driving amp is of switched variety, imagine added noise of all kinds and varieties - rendering any listening Mission Impossible.

    Grounding /earthing IS provided via HDMI connection for use with other iFi Audio equipment, as well when signal is provided via balanced XLR input. iFi does sell an accessory called Groundhog to address the problem you experience - enabling connecting the ground also in case when Pro iESL is driven via speaker terminals.

    The easiest way would be including a ground/earth terminal at the back of the box - from where any wire could be attached to the ground of the amp driving the Pro iESL. The only way one can ground/earth Pro iESL in its currently available form when driven via speaker terminal input without the Groundhog is by using a 4pin XLR input connector, with only case/shield being connected to ground wire which connects to some proper ground of the amp driving the Pro iESL.
     
    Slim1970 likes this.
  3. Muinarc
    I experience a faint hum when the iESL is off, but the hum completely goes away when I turn it on (input set to "speaker"). The hum completely goes away even if I turn the volume way up with no music playing.
     
  4. Slim1970
    I’m using it with the Pro iCan with the included hdmi cable. Not sure why there is so much hum. Since I’m using the hdmi cable how will I connect a grounding adapter since I’m not using the speaker taps?
     
  5. iFi audio
    There is no need to connect anything if used in tandem with the iCAN Pro via the ESL Link cable. Also, can you please provide us with more nfo about this hum?

    Please open a ticket on our support platform and we're positive that we'll be able to help you from there:

    http://support.ifi-audio.com

    And lastly, as a rule, unless there is hum on the amplifiers output (meaning the amplifier produces hum due to ground-loops or other issues) there can't really be hum from the iESL.
     
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  6. Slim1970
    The hum is immediate. Meaning as soon I plug in my Stax headphones I hear the humming and it's a significant hum. It dominates the music when listening and when there's no music playing is annoying loud. I'm using the ESL Link and it powers up just fine.But as soon as my Pro iCan comes out of warmup the hum begins. I've been in contact with iFi support and they are sending out a ground adapter. I'm not sure how it works but I appreciate the quick response on my issue. Hopefully the ground adapter fixes the hum.
     
  7. iFi audio
    Good, please let us know how it went once you have ground adapter.
     
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  8. Slim1970
    @iFi audio will do. thanks!
     
  9. Slim1970
    @iFi audio I got the ground adapter today and I am happy to report that the humming is gone. Thanks for the great support!!
     
  10. iFi audio
    Yup, you're welcome!
     
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  11. Hansotek
    @iFi audio - Can you run power to the iESL via the [iESL’s] balanced input from a single-ended / unbalanced headphone amplifier output? Wondering if I can just hook that up to another headphone amp with a 6.35mm to 4-pin female connector. Figured I should ask before I go and blow something up though.
     
  12. paolin
    I have another question :
    if i connect a dynamic or planar headphone with the iESL drived byspeaker terminals, how can i adjust the AC Termination and Impedance knobs ?
     
  13. Fastnbulbous
    The manual has recommended settings for various headphones. What about the Voce?
     
  14. iFi audio

    Taken from the manufacturer's webpage:

    https://www.mrspeakers.com/headphones-14/voce.html

    "580V “Pro-bias” compatible for use with any Stax-pro compatible amplifiers". So look under Stax Pro.
     
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    Fastnbulbous likes this.
  15. Fastnbulbous
    Great! With luck I'll get to try it by the weekend!

    And it sounds like the general recommendation is 96Ω impedance. Manual:

    "The impedance response can be adjusted from 16Ω to 96Ω. This impedance describes the load impedance for the driving amp with a "standard" electrostatic headphone connected. Lower impedance settings create a greater step-up and will produce a louder sound level at the same headphone amplier volume setting. Lower impedance settings are a much more difficult load for the driving amplier. Please adjust to suit listening preferences, however, in most cases the higher impedance setting is recommended."
     
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