Chord Mojo(1) DAC-amp ☆★►FAQ in 3rd post!◄★☆

[Mython]

 

  ok, i tried another cable, and worked...
 
this E18 cable is maybe not an OTG or is just for the fiio device

i rectify...
 
it works because it's recognized, but the playback is distorted a faster!! What?!?!
 
EDIT: my fault, i had to change settings in the player, but playback is slightly digitally distorted...
 
HF Player: distortion and "slow motion" playback
 
 
 
this mojo definately sucks for android reproduction.

 
 
Quote:

  i hope to solve my problems to keep the mojo till the arrival of the modules.
 
if i don't solve it, mojo's gonna be sent back to the seller

 
 
I mean this with complete respect to you, but I find it a little strange that you are pointing the finger of blame at the Mojo - there is clearly something going on with your phone (and possibly with the connection).
 
 
I say this because there are literally thousands of people enjoying top-quality music reproduction, around the world, with many different Android phones, hooked-up to a Mojo.
Therefore, evidently, Mojo does not suck for Android music reproduction. You seem to just have an issue that we just need to be sensibly trouble-shoot

 

[Blasyrkh]

  Therefore, evidently, Mojo does not suck for Android music reproduction. You seem to just have an issue that we just need to be sensibly trouble-shoot

 
I think that for this reason, the only answer is that it's defective....
 
tomorrow at work i tried it with my huawei mate 7 and a note3
 
E18 with its cable and otg adapter, and the Benchmark Dac1 with the otg adapter, are working flawlessly with my phone.
 
it seems that my mojo can't synchronize properly with the phone

 

[Mython]

Can you please exactly describe these details:
 
 
1) Smartphone model
 
2) Android version
 
3) Player software version
 
 
 
4) Are you experiencing the distortion and playback speed issue with all music file sample rates? (e.g. 16/44.1, 24/96, 24/192, DSD, etc.)
 
5) Have you tried rebooting your phone?
 
6) Have you tried closing other background applications, to reduce CPU cycles, whilst you are playing music?
 
7) What colour is Mojo indicating as the sample rate? (need to be sure that your phone is not upsampling the music, by default, prior to sending it over the USB connection, to Mojo)
 
 
 

 
 
8) Have you tried using the exact same phone and cable with a different DAC-Amp?
 
9) Have you tried using a different cable with your phone and Mojo?
 
 
 
 
Many other possibilities, but the above can get us started, with troubleshooting your problem

 
 
 
It is possible that you might have a faulty unit, but that does not mean that all Mojos fail to work properly with Android devices, and we should try other possibilities before assuming your Mojo unit is faulty.

 

[Blasyrkh]

  Can you please exactly describe these details:
 
 

 
thanks for the effort mate ! 
just to clarify, i am a computer scientist, and I have been using these devices for ages...so i'm not a newbie
 
 
1- i used my mate 7 with lollipop, and a note 3 with lollipop, using the latest usb player pro version
 
2- i rebooted and reistalled the software several times and distorsion is present in 44.1/16 and 96/24 (i didn't tested any other sample rate)...the color displayed is the right one
 
3- i tried 4 usb-micro usb cables and 2 OTG adapters....plus i tried the 2 OTG micro to micro that were given with the E18
 
 
4- e18 and benchmark Dac1 work flawlessly (and honestly, this point is more than enough to make me think the mojo has a problem)

 

[Ra97oR]

 

  Can you please exactly describe these details:
 
 

 
thanks for the effort mate ! 
just to clarify, i am a computer scientist, and I have been using these devices for ages...so i'm not a newbie
 
 
1- i used my mate 7 with lollipop, and a note 3 with lollipop, using the latest usb player pro version
 
2- i rebooted and reistalled the software several times and distorsion is present in 44.1/16 and 96/24 (i didn't tested any other sample rate)...the color displayed is the right one
 
3- i tried 4 usb-micro usb cables and 2 OTG adapters....plus i tried the 2 OTG micro to micro that were given with the E18
 
 
4- e18 and benchmark Dac1 work flawlessly (and honestly, this point is more than enough to make me think the mojo has a problem)

What option did you use on the UAPP? I found that my Z1 on Lollipop only like running with USB tweak 2 on with 50 msec + buffer size.

 

[Blasyrkh]

 
What option did you use on the UAPP? I found that my Z1 on Lollipop only like running with USB tweak 2 on with 50 msec + buffer size.

 
mine, without tweak1 active, makes the playback faster with distortion.
 
i tried all buffer sizes and setting without solving

 

[Mython]

 

  Can you please exactly describe these details:
 
 

 
thanks for the effort mate ! 
just to clarify, i am a computer scientist, and I have been using these devices for ages...so i'm not a newbie
 
 
1- i used my mate 7 with lollipop, and a note 3 with lollipop, using the latest usb player pro version
 
2- i rebooted and reistalled the software several times and distorsion is present in 44.1/16 and 96/24 (i didn't tested any other sample rate)...the color displayed is the right one
 
3- i tried 4 usb-micro usb cables and 2 OTG adapters....plus i tried the 2 OTG micro to micro that were given with the E18
 
 
4- e18 and benchmark Dac1 work flawlessly (and honestly, this point is more than enough to make me think the mojo has a problem)

 
No egg-sucking implied or intended - just wanted to slow down the conclusion, and examine the situation.
 
If you really think you've tried many permutations and buffer settings, to no avail, then I suppose (not the only, but) the most obvious next step would be simply to try someone else's Mojo, on your set-up, with no other changes, and see if you get a different result. As I said (and as I know you already realise), there are many thousands of people using Mojo with Android phones, very successfully, so your situation is rather peculiar, and most certainly does not demonstrate that Mojo fails with Android, as a general rule. I'll be interested to learn from this, as to what the true culprit turns out to be.

 

[Blasyrkh]

   
 
 
If you really think you've tried many permutations and buffer settings, to no avail, then I suppose (not the only, but) the most obvious next step would be simply to try someone else's Mojo, on your set-up, with no other changes, and see if you get a different result.

 
sadly i can't, i have no friends with mojo....
 
i'll just wait and see if at least the other user with the e18 cable makes it work
 
if that works for him maybe it's my mojo having problems with otg

 

[Mython]

I suppose another possibility is that UAPP might have introduced a minor buffering glitch in the latest version? (I'm not blaming UAPP - just wondering if it might possibly be an explanation).
 
 
That aside, I know some users have reported a similar symptom with iOS beta 9.3, which resolved when iOS was updated.
 
 
Do you run a lot of CPU-intensive apps on your phone, what with you being a power-user?

 

[Blasyrkh]

apps were closed, but i don't use any strange cpu-stressing app anyway
 
 
i  was wondering...E18 is asynch or sync usb?

 

[Deftone]

Its two piece if you carry a phone when you take your dap! if your already carrying a smart phone with you as most people do these days you already got half a really high quality dap ... With Mojo you've got the rest of it! So both are two box solutions really either phone and Dap or phone and Mojo.

 
thats fair enough and i can see it like that for most but for me i like to stick my phone in my pocket and rarely use it unless for emergency. smartphones and facebook etc does my head in. 

 

[masterpfa]

   
where can i find news about these modules?

 
Originally Posted by bestula 
 

Not before Autumn according to a previous interview with Rob Watts. 
https://www.youtube.com/watch?v=3e7SRXP3RHI
First module will be a bluetooth one maybe in 2-3 months. And the sd card module with screen later on (5-7 months from now).
But no more info yet.

 

EDIT: Oops I see this has already been answered but I shall leave the link for the video for @Blasyrkh

 

[tuna47]

Why would my iPad sound better than my iPhone with mojo source is lighting port so no phone dac or amp involved iPad has a much larger sound stage

 

[Mython]

Why would my iPad sound better than my iPhone with mojo source is lighting port so no phone dac or amp involved iPad has a much larger sound stage

 
Less RF being generated by the iPad, perhaps?
 
Also, have you checked to make sure that they're both not upsampling?

 

[bavinck]

  I suppose another possibility is that UAPP might have introduced a minor buffering glitch in the latest version? (I'm not blaming UAPP - just wondering if it might possibly be an explanation).
 
 
That aside, I know some users have reported a similar symptom with iOS beta 9.3, which resolved when iOS was updated.
 
 
Do you run a lot of CPU-intensive apps on your phone, what with you being a power-user?

I am getting glitching on UAPP as well, never had it before recently. I assumed it was a mojo problem. Guess I will try with another dac.