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

Discussion in 'Portable Source Gear' started by Mython, Oct 14, 2015.
  1. Mojo ideas
    . I cannot stress more firmly than this. I'm sorry for this my next response! Please do not use these external power supplies. If you do you maybe risking seriously damaging your Chord units and it will be on our shoulders to repair the mess they've caused. Companies that make these products are often not capable of analysing what they trying to achieve. Also the Companies producing these units will often propose that their power supplies can improve the performance of chords designs which is total nonsense. Therefore we strongly recomend you save your money and disregard the complete twaddle put about by these companies. After all had their engineering capabilities been good enough they would be producing complete products rather than just parisitising ours. I'm sorry if it sounds like I'm annoyed it's because I am!
    canali, Traveller, vapman and 5 others like this.
  2. rcoleman1

    Thanks for the warning @Mojo ideas [​IMG]
  3. vapman

    Love my Seismic Audio cables, mine is either 6 or 10 feet and is a nice thick blue cable. However it's incredibly light and flexible for how big it looks. Nothing like those Monoprice premium cables that will break everything you plug them into :wink:
    Cost a bit under $10 shipped for the one cable i think.
  4. redstar
    Sorry for sounding Naive, there is alot to get through. I am curious, is there a problem when using Spotify with the Mojo?
  5. miketlse
    I don't remember one. Why do you ask - are you experiencing problems of some sort?
  6. redstar
    A few pages back i read something along the lines of 'The problem is, I mainly use Spotify which uses Directsound, so it doesn't play nice with the Mojo'.
    Something regarding clicks?
  7. x RELIC x Contributor

    Mojo won't have a problem with Spotify. It has no idea what Spotify is and that is not what Mojo's function is.

    Mojo is a DAC. It will receive a digital bitstream and convert that sampled data to an analogue signal to output to headphones. If your source can play Spotify and output the digital bitstream then Mojo will see that bitstream and convert it.

    Issues like "clicks" and noise are just picked up or heard through the Mojo, but the Mojo is certainly not the cause of these issues.
  8. Mython Contributor
    I happen to know someone who feels similarly about a related tangent of the above topic: www.head-fi.org/t/702787/chord-hugo/4830#post_10634257
  9. shultzee

    Audio quest Evergreen for me
  10. rkt31
    audioquest even makes a hard 3.5mm stereo to 2 rca adapter. http://www.audioquest.com/custom-install/splitters-connectors/
  11. Traveller
    I have the 1st gen* Kimber Kable and this is their curr-gen offering:


    *Ah, yes, KK's "Tonik":
    (Cp) parallel capacitance: 52.0 pF @ 20 kHz
    (Ls) series inductance: 0.772 µH @ 20 kHz
    (Rdc) dc loop resistance: 0.055 Ω
    (Xt) total reactance: 0.098 Ω @ 20 kHz
    Frequency response ± 0.5 dB dc - 2.8 MHz
  12. Currawong Contributor
    It's difficult if you don't understand anything about digital filters or even digital-to-analog conversion. What's worse is that it is argued about even by experts. 
    For the Mojo (and other Chord DACs) you want to have it receive bit perfect data. That is, you do not want any re- or up-sampling done by your computer before it sends the data to the Mojo. If you are playing a CD-quality (44.1 kHz 16-bit) file, you want the computer set to send out CD-quality data. If you are playing back high-res files, then you want the computer sending out the data at the same resolution as those files. If the computer is re-sampling, it will interfere with the Rob Watts' designed digital-to-analog conversion in his products, which is designed to be far superior to the re-sampling software built into Windows (and OSX).
    EAC might take longer, which is what I guess you're referring to, but the output file type wont affect the speed, nor the quality of the playback (unless your computer or software does something funny causing it to).
  13. GreenBow
    I didn't say I didn't understand digital filtering or D to A conversion. I said I had no idea the Mojo could upsample. (I think I know what you mean though about people not understanding up-sampling. I hear people saying how can you add sampling points? Anyway I never dug deep enough on the internet to learn how upsampling is accomplished.
    Anyway I should add that I was extremely tired yesterday when answering those post about clicks. After the last post I made I put some music on to drift for a while before sleep. However I do not remember a single note: I was asleep instantly.
    It got a bit bored because I was being misquoted. The last post I answered in reply to @Nitrile it was suggested I should try the JRiver trial. Whereas the post Nitrile wrote that in, was a reply to a post where I said I had JRiver on my PC. (It was included in the reply quote.) Nitrile wasn't the only one. I am sure they were trying to help though. Plus as I say I was exhausted out of my mind and definitely not thinking right.
    The point was to try to interact because some of us have an issue with clicks. Thus we are all hoping for help.
    I was talking about re-ripping my CDs. The software I use all the time for that job, I know nothing about its reputation for doing that job; Media Go. I suspect JRiver might be better at it, so I could use that and rip my CD's again. Or of course I could use EAC which Mython was kind enough to re-supply the link for. However I have not yet established how to get art-work for EAC ripped files, organised.
    Yes I use bitperfect with JRiver. I'd recommend anyone using bitperfect. While sometimes it may not always be obvious the gain over DirectSound in quick A-B testing. It's easier to see the difference if you listen to DirectSound for a good while, and then bitperfect for a long while. It's pretty much instantaneous the difference. My best example for spotting how nitperfect improves sound, is playing DVD. E.g. I recently bought Star Trek: The Next Generation on blu-ray. My media player can run bitperfect sound. The voices when playing bitperfect are much more in their own defined space in the soundstage. It's crystal clear night and day difference. DirectSound makes it all flat and squashed up against the back wall.
  14. audi0nick128

    Yeah I was referring to the process of riping taking longer.
    P. S. Quoting complex posts is difficult on a phone... But my will was good :)

  15. EagleWings
    From the time I made this above post, I have had the same issue repeat itself a few times. Mojo powers ON, Receives the Signal (the Power ball lights up), but does not output any signal through headphone output. Not just the music, there is literally no output into my IEM, because I usually hear a faint hiss on my IE80 when I connect it to the Mojo.
    I figured, this happens whenever the Mojo has not been powered on for more than a day (>36Hrs). So in order to get it to work again, I need to Press and Hold Down the Power Button + One of the Volume Buttons, while the Mojo is in the OFF state. The issue is regardless of the source (iPhone 6, PC, Mac, Fiio X3ii).
    Anyways, I have contacted the retailer for a replacement. However, wanted to check with @Rob Watts and @Mojo ideas, if this procedure of pressing and holding the Power Button+Volume Button is a form of device reset.

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