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Chord Mojo DAC-amp ☆★►FAQ in 3rd post!◄★☆

Discussion in 'Portable Source Gear' started by Mython, Oct 14, 2015.
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  1. audionewbi
    Some of the comments in here honestly makes me want to get a hold of a second mojo so I can compare it with my unit. I have no of the problem you guys face, nor I find Mojo resolving or too resolving. I only get hiss with ck100pro and that is only when I listen at high volumes, at low volumes with music on I hear no hiss. 
     
  2. Ivabign

    No, it was determined that my unit suffered from a known issue - it was returned and swapped for a new one.
     
    EDIT: My unit had more than a hiss - it was a hum with interesting characteristics.... I detailed it in earlier posts.
     
  3. prismstorm
    So I connected the Mojo to my iMac this morning and the power button is constantly purple (indicating 192/384kHz according to the packaging box and the manual) no matter what sample rate I play. It is simply stuck at purple forever regardless of the variance in different sample rates being played. Is this normal (it will only show purple when connected via USB to a computer) or is my unit faulty?
     
    Also, I plugged the 3.5mm TRS of my 7 year old Harmon Kardon Soundsticks into Mojo and it plays just fine, but am I not supposed to do that (Mojo only meant to drive iems or headphones and not speakers of any kind regardless of price and tier).
     
    The sound so far seems quite clear, resolving, detailed but is a tad bright for me, will burn-in help or should I change to black filters on my SE846 to tame the treble?
     
  4. Ivabign

    What program are you using - iTunes? If so, the Mojo will display whatever the max frequency you picked in the MIDI program - it won't change with the individual tune....
     
  5. glider
    I actually changed to the black filters on my SE846s and preferred those with the Mojo (at least so far). I'll probably swap back and forth to compare some more, but I preferred the slightly more relaxed sound of Mojo + black filters. 
     
  6. Torq

    100% sure ... otherwise the hiss would be heard with the Mojo switched off as well.

    The SE846 are 9 ohms, 114 dB SPL/mw.

    It's not something I consider to be a problem. Someone asked if the Mojo was silent with the SE846, mine isn't. That there is very low level audible noise doesn't mean it's intrusive. It's incredibly quiet ... certainly not audible over the quietest musical passages ... but if there's a silent pause then it's there even if it's barely audible.

    I'm not trying to troubleshoot it as it's not a problem. If I thought it was, I'd return it.
     
  7. headwhacker
     
    Check the global sample rate from the Audio Midi Setup. It must be set at 192khz.
     
  8. headwhacker
     
    The question is  it on the recording or the Mojo itself? It's a problem with mojo if the hiss is present and no music is playing.
     
  9. Torq

    The CK100 pro is 39 ohms and 109 dB SPL/mw sensitivity, so they'd need almost twice the signal, after allowing for the impedance delta, to register a noise that would be audible on the SE846.

    Interestingly, if you put the SE846 attenuator inline then the hiss vanishes (impedance change).
     
  10. shigzeo Contributor

    The ATH-CK10 is 55Ω @107dB SPL/mw and it is pretty sensitive to hiss. I think people that are not sensitive to hiss are not sensitive to hiss. And there there are people like me. 
     
  11. Torq

    It's audible with no source connected, with a source connected but not playing, when playing a silent .WAV file.

    I don't think it's a "problem" with the Mojo at all. There's no such thing as a noiseless electronic circuit. It's barely audible with the most sensitive IEMs I have. BARELY. But barely isn't silent.
     
  12. shigzeo Contributor

    No: lots of DACs/amps/players hiss with no music playing. Some turn their amp section off prior to playing music, and appear to be dead silent. They may then show hiss on paused signals. Hiss is present on ALL sources, it's just a matter of having a sensitive enough piece of equipment to register that hiss. All Mojos will hiss. There may be a minimum level of it we may expect, and beyond that, some defective units, but hiss is completely normal. But sometimes, that hiss is much, much lower.
     
  13. headwhacker
     
    I expect at minimum level the hiss should not be audible.
     
  14. shigzeo Contributor

    I have no idea if the unit I borrowed had all its stones in a row or not. But it hissed at minimum levels of volume. It hissed on a level, or slightly more, than an original AK100. Manageable, but too much for me. Still, everything else is phenomenal.
     
  15. audionewbi
    Here is my luck, I have no problem with hissing (not that major) but the sound is still not quiet there. It is a power monster and in its size it is very impressive. I am keeping it purely for that.
     
    My aim is to eventually stack it with A17 Walkman once the dongle come out. For me it is not quiet the end it all product. 
     
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