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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. masterpfa
    I've only bought these because of the Mojo.
    There I was happy with my Fiio E18 but like most of us seeking to improve on what we can hear. Started the research for the Oppo HA-2, but ended up getting the Mojo after glowing reviews from every Hi-Fi mag article I had read.

    No regrets at all (my credit card on the other hand doesn't seem to agree)
    [​IMG] 
     
    P.S. last 2 pictures from the ad's I purchased these from [​IMG]
     
    Quote:
     
    Is that DSOTM by any chance, I hear so many members here refer to it. What version do you have?
    If it's as good as people are saying, maybe one for my library and to hear on my HD800's
     
    [​IMG] 
     
  2. joshk4
     
    I think you made the right choice taking Mojo over HA 2 :)
     
  3. masterpfa
    I took a gamble and the Mojo was not that far outside my original budget.
    But as you have had both I trust your judgement and opinion. [​IMG] 
     
  4. Mython Contributor
     
     
    That's a nice bottle of certified organic kombucha [​IMG]
     
    In case anyone is wondering; Mojo is certified organic-sounding  [​IMG]
     
  5. Bighappy

    So nothing wrong with using the iPhone 6+ as a source at all...Tidal just isn't what it says it is ? :wink:...Sounds like I may be better off sticking to Apple Music & Opoo HF for my hi-res audio? Thanks for the help!
     
  6. Mython Contributor
     
     
    My understanding is that they are working full-speed, on developing and producing the modules as soon as reasonably possible, but that it would be counter-productive to prematurely make promises as to exact ETAs.
     
    I know that sounds like a really lame and irritating answer, but it's the simple truth, as I understand it.
     
    The way I see it, there is more integrity from a company (and less anguish to customers) if a product is formally announced when it is actually nearing completion, rather than stringing people along with a repeatedly delayed ETA.
     
     
    Chord are on the case (pun intended). It will happen when it's ready to happen.
     
    Until then... might I suggest kicking back with your headphones on, a Mojo fired-up, and one or two of these?
     
    kombucha.jpg
     
    [​IMG] 
     
  7. Whitigir
    Mind blown!......blown...what are we looking at ? Note 4 to Mojo, and converted 16/44.1 and 24/96 to DSD and feeding Mojo


    image.jpg
    image.jpg

    Used stock mojo cable with OTG adapter . Can be found here on Amazon
    http://www.amazon.com/gp/product/B015XA3W0G?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00

    image.jpg

    The software (app) used was the Onkyo HF Player paid version, that can digital out high-red and or up convert to DSD feeding mojo
     
    masterpfa likes this.
  8. Rob Watts
    Converting the original file into DSD or up-sampling is a very bad idea. The rule of thumb is to always maintain the original data as Mojo's processing power is way more complex and capable than any PC or mobile device.
     
    DSD as a format has major problems with it; in particular it has two major and serious flaws:
     
    1. Timing. The noise shapers used with DSD have severe timing errors. You can see this easily using Verilog simulations. If you use a step change transient (op is zero, then goes high) with a large signal, then do the same with a small signal, then you get major differences in the analogue output - the large signal has no delay, the small signal has a much larger delay. This is simply due to the noise shaper requiring time for the internal integrators to respond to the error. This amplitude related timing error is of the order of micro seconds and is very audible. Whenever there is a timing inaccuracy, the brain has problems making sense of the sound, and perceives the timing error has a softness to the transient; in short timing errors screw up the ability to hear the starting and stopping of notes.
     
    2. Small signal accuracy. Noise shapers have problems with very small signals in that the 64 times 1 bit output (DSD 64) does not have enough innate resolution to accurately resolve small signals. What happens when small signals are not properly reproduced? You get a big degradation in the ability to perceive depth information, and this makes the sound flat with no layering of instruments in space. Now there is no limit to how accurate the noise shaper needs to be; with the noise shaper that is with Mojo I have 1000 times more small signal resolution than conventional DAC's - and against DSD 64 its 10,000 times more resolving power. This is why some many users have reported that Mojo has so much better space and sounds more 3D with better layering - and its mostly down to the resolving power of the pulse array noise shaper. This problem of depth perception is unlimited in the sense that to perfectly reproduce depth you need no limit to the resolving power of the noise shaper. 
     
    So if you take a PCM signal and convert it to DSD you hear two problems - a softness to the sound, as you can no longer perceive the starting and stopping of notes; and a very flat sound-stage with no layering as the small signals are not reproduced accurately enough, so the brain can't use the very small signals that are used to give depth perception.
     
    The second issue in using the transport to up-sample (44.1 to 176.4 say) is that the up-samplers in a PC or mobile device are very crude, with very limited processing power and poor algorithms. This results in timing problems, and like with DSD you can't hear the starting and stopping of notes correctly. These timing problems also screw up the perception of timbre (how bright or dark instruments sound), the pitch reproduction of bass (starting transients of bass lets you follow the bass tune), and of course stereo imagery (left right placement is handled by the brain using timing differences from the ears). Now Mojo has a very advanced algorithm (WTA) that is designed to maximise timing reconstruction (the missing timing information from one sample to the next) and huge processing power to more accurately calculate what the original analogue values are from one sample to the next. Its got 500 times more processing power than normal, and this allows much more accurate reconstruction of the original analogue signal.
     
    So the long and the short is don't let the source mess with the signal (except perhaps with a good EQ program) and let Mojo deal with the original data, as Mojo is way more capable.
     
    Rob
     
    Chord Electronics Stay updated on Chord Electronics at their sponsor page on Head-Fi.
     
    https://www.facebook.com/chordelectronics https://twitter.com/chordaudio http://www.chordelectronics.co.uk/
    onsionsi, Pokemonn, Currawong and 6 others like this.
  9. JustAHobby
    Hello, this is my very first post and I'm giving it to the chord mojo thread as this truly deserves more praise. I got mine yesterday and after the long 10 hours initial charge I brought it out with my Samsung note 5 and plug in my 1964ears ADEL U8.

    I'm now wondering how are the rest of you carrying it around with your phone as the DAP? It's my first DAC and I would hate myself if I dropped it along with my phone.
     
  10. Whitigir
    Thank you Rob, and I appreciate. I was just a little too excited for it though...especially note 4 works with mojo, hence it was fun to report :D. Anyways, I agree, and I am thankful for your time and explaination. Thank you for being with us
     
    Mython likes this.
  11. OneTallGuy
    How do you know what the DR scores are?
    Where can I find this information about albums?
     
  12. rmullins08
    http://dr.loudness-war.info/
     
  13. audi0nick128
    I wouldn't say that.
    I think Tidals Sq is superior to other streaming services...it is lossless, but not hi res. And keep in mind that it is only a question of time until they will announce MQA, imo it will happen during CES.
     
  14. audi0nick128
    @Mython

    I think you're right... Searching for a new dap to go with mojo... I was thinking geek wave :D
     
  15. Bighappy
     
     
    Thank you...Excited to see what happens with Tidal! I do really enjoy it...Just wanted to make sure I was getting something "different" than what I was with Apple Music...Thanks again!
     
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