Schiit Jotunheim has no grounding / hum issues.

Discussion in 'Audio Science' started by purr1n, Jul 22, 2018.

  1. purr1n

    purr1n Desire for betterer is endless.

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    Don't take it personally. I'm glad you got the issue fixed. I just wanted to point out that your issue probably had nothing to do with chassis grounding because any hum issue from poor chassis grounding would not be audible - per the objective measurements.
     
  2. HumanFly

    HumanFly Acquaintance

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    To be honest, I didn`t even look at the measurements. ( If you mean the ones posted on ASR that is.)
    And I can take it, even if it`s personal :) . Thanks for taking the time to explain things further.

    And if I lived in the US and could find my bill for the warranty I would send it in before opening it up for sure.
     
  3. Flemur

    Flemur New

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    Hi all - sorry to resurrect this old thread.

    I stumbled across these mentions of Jotunheims humming yesterday when trying to use my own current gear as a case for exploring the whole Amir vs everyone else drama after a post on reddit nicely summarising the whole thing.

    I then went and dialed up my Jot and realised that I also have this audible hum/buzz whenever I touch the volume wheel or upper part of the case. It's inaudible at the volumes I actually listen at - it only occurs on high-gain setting from 12-o'clock and up (which is probably the volume Amir would listen at going by some of the criticism). I did try disconnecting everything but the Jot power plug and my headphones, and I still get the hum, so I believe it is not coming in through my DAC. Very likely that it is coming from the fact that my Jot is in a shared powerstrip with my entire PC setup.... and I can't really see a practical solution to solving that in my current setup.

    Anywho, for now it doesn't bother me besides from knowing that the issue is there, and the slight worry that something is wrong with my Jot / whether it's unsafe in any way. I simply popped it back into low-gain (I had it in high gain as default because moar power = moar better). I'm fairly sure my Jot is out of warranty, since I bought it used about 4 years ago.

    So what I'm asking for I guess is:

    a) should I care about this

    b) is there anything I can do about this? (I guess not sharing a power strip with a PC?)
     
  4. Tachikoma

    Tachikoma Almost "Made"

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    It sounds like touching the case creates a ground loop between you and the Jotunheim's ground. Just stop touching the case.
     
  5. gepardcv

    gepardcv Almost "Made"

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    You can probably fix the case ground loop problem by opening it up (unplug from power first!) and doing a bit of investigation with a multimeter. You might have to solder a few wires in strategic places. I don’t have an OG Jotunheim, so can’t comment on more specifics than that.

    Edit: There’s a post upthread about a similar-sounding problem and suggestions about fixing it: https://www.superbestaudiofriends.o...-grounding-hum-issues.6664/page-3#post-257085
     
  6. bilboda

    bilboda Florida boomer

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    4 isolated outlet pairs
    https://zerosurge-com.3dcartstores.com/8R15W-I_p_17.html
     
  7. Flemur

    Flemur New

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    Thanks for the replies everyone


    Yeah as stated, it's not currently actually bothering my listening, since it only occurs for the period that I'm adjusting the volume - hence my question: should I care about it? Even if it's not a problem in terms of my listening, I was thinking that it's at least indicating that something is suboptimal.

    I'm asking here specifically due to that suggested fix, and the fact that several (seemingly very knowledgeable people) commented that all of that work with sanding, etc, may not actually have been the fix - hence I wanted some sort of sanity check of what the issue could potentially be, before tearing the unit apart and sanding down specific areas. Same goes for soldering in wires (except I'd have no clue about where to solder them ;) )


    Does stuff like that actually work? I always just assumed that all of those "hifi power strips" power purifiers, etc were pure mumbo jumbo. I do have a surge protected power strip, but it's not isolated / shielded as this (and various other hifi options) claim they are. That'd definitely be an easy fix, but those strips are notably more expensive here in Denmark, so I'll have to do a little more research on whether that would actually be able to solve my issue (which as stated, is not a big issue, more just a concern).

    Basically, I just wanna ensure that nothing is inherently wrong with my unit that would require it to be fixed / replaced - due to being unsafe or whatnot.
     

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