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

Discussion in 'Portable Source Gear' started by Mython, Oct 14, 2015.
  1. 2bxfile
    Thanks Veteran for that thorough explanation.  You went far and beyond the call of duty on that one.
    "We who are about to die, salute you"
    theveterans likes this.
  2. jmills8
    Its not an issue with the Mojo. The question will the phone be able and do you have the right otg cable.
  3. td1200
    I have tried 3 phones; Oneplus one, Meizu MX4 pro, Xiaomi Note pro, using Onkyo app with the DSD files.
    Only Oneplus one that the light on Mojo shows white color, which means it can send DSD out.
  4. music4mhell
    You have Onkyo pro version on all three mobiles ?
  5. td1200
    Yes I do. 
  6. Jazic
    I just did some more comparisons between the Mojo and Lyr 2 with Mojo as the DAC and found the Lyr 2 has a very slight mid bass punch that the Mojo doesn't have. Also the separation on high hats and cymbals is better on the Lyr 2 which might translate to brightness but it's not sibilant by any means. If anything it's further extension above 16Khz that gives it more air than the Mojo.
    The differences are microscopic and you really have to listen very very hard to hear any differences. 
    I can agree that the Mojo is more than powerful enough but the Lyr 2 with these Amperex 7308 tubes just makes planar magnetics sing. The Lyr 2 is a tad harsh with my TH900's though compared to the Mojo which has a meatier and more tamed sound on the upper mids which I'm sensitive to.
  7. Rob Watts
    If you fully charge Mojo then use it in a desktop it will not switch off; the power dissipation that the charger uses in matching the current drawn by Mojo is negligible. You are only at risk when charging and using at red - and indeed as Mython says putting Mojo on its side will solve that issue too.
    Just to give you some numbers - fully charged and matching Mojo's current draw the power dissipation is 107 mW for the charger circuit. That will increase running temperature by less than 1 deg C. But at flashing red it is 910 mW for the power dissipation in the charger.
    Now I could fix this by using a switcher based charger rather than a linear one - but these inject too much RF noise onto the battery. This would impair sound quality, and Mojo's design goals was that plugging in the charger would have no significant change in SQ - which would not happen if I used a switcher based charger. I am not prepared to damage SQ as to me this is the most important aspect just for a tiny improvement in usability.
    Chord Electronics Stay updated on Chord Electronics at their sponsor page on Head-Fi.
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    Isn't there a Kintex 7 in the Mojo? Maybe it's a smaller part in the family, but it's also Xilinx's latest generation of parts. These are not small by any measure... It's remarkable the resources they're packing into these things... Particularly DSP48 slices and BRAMs which are useful for these types of signal processing applications. And they're able to run the parts at higher clock rates and lower power than previous generations. Plus the new Vivado tool is a complete overhaul of the old ISE design suite... Synthesis tool is a bit smarter, but PAR does an infinitely better job of closing out timing.

    Also, any chance we could stop with the marketing cliches? The 44 DSP cores are what, individual modules in the RTL hierarchy? Are these meaningful modules or do they include things like synchronizers for clock domain crossings too (assuming there are any, just an example)? 26,000 taps is for one filter? Or the number of taps in all the filters combined? Are we talking about a giant polyphase FIR or a number of filter stages in different parts of the processing chain? What is the point of interpolating up to 200+MHz? Surely the DAC is not capable of running at that rate... And if it is, why?

    Sent from my E5803 using a highly trained, special forces carrier pigeon
  9. Currawong Contributor
    I'm surprised nobody has come up with a vertical stand for the Mojo yet.
  10. Fungus
    but won't all otg and otg supported phone function the same?  
  11. Jazic
    I bought the leather case for my Mojo just so I could bedazzle mine. Jk!
    Seriously tho, I didn't mean to get everyone off tracking and arguing. I personally have a love affair with my Lyr 2 and Amperex tubes. I replaced my Hugo with the Mojo as a DAC for it. I found the Hugo to be sterile and detail oriented to pair with the Lyr 2 with certain headphones namely the TH900 which is already prone to sibilance in the upper mids.
    The Mojo isn't as bright as the Hugo and the Lyr 2 kind of amplifies the meaty sound and adding some sparkle up top which I happen to adore. 
    The Mojo by itself is a freaking insane unit and if I had nothing else I would be silly to look elsewhere. But unfortunately, I've heard both and prefer my current stack with Mojo feeding the Lyr 2. It might sound horrible to some but to me its awesome. 
    I'm only talking 1 type of cans which are ortho's. My TH900's sound better on the Mojo by itself as the amp instead of the Lyr 2. My ears are weird so take what I'm saying with a grain of salt.
  12. jmills8
    There is the new c type usb. I demoed a few phones and many phones had different usb connections that wouldnt connect the mojo.
  13. Jazic
    don't they make USB type C adapters to work with Micro USB?
  14. jmills8
    Yes big adapters. As if now makes it difficult to take the Mojo on the go. Right now in HK to connect the Mojo to the Cayin i5 Android Dap it requiers a big adapter. Only a few shops have.
  15. maxh22

    There are tons of inexpensive cell phone stands that will hold Mojo verically in place . I don't think there is a huge need for such an item unless Chord wants to make their own, higher quality stand for desktop use.

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