Chord Mojo DAC-amp ☆★►FAQ in 3rd post!◄★☆
Apr 26, 2016 at 2:34 PM Post #16,801 of 42,185

Koolpep

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Average temperatures per month where I live for the last 10 years. Peaks go to 122 Fahrenheit on rare occasions during the summer.
 
 
The mojo gets hot, so does the hifiman 901.
 
 
Cheers!
 
Apr 26, 2016 at 2:36 PM Post #16,802 of 42,185

x RELIC x

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I tested Hugo and I have to say there are differences in details and sound stage. Perhaps, the best way to describe scientifically describes the differences is look at the sin waveform produced by the two:

For Hugo:


for Mojo:


for Dave, because why the hell not :D



here is for [COLOR=222222]PCM1795:[/COLOR]



Reference:
http://www.themp3music.org/t/766517/chord-electronics-dave/1665
http://www.stereophile.com/content/chord-electronics-mojo-da-headphone-amplifier-measurements#t3FCox2wLJd4Ejl0.97
http://www.stereophile.com/content/chord-electronics-hugo-tt-da-headphone-amplifier-measurements#syfXR2XmUf1JPiKW.97
http://archimago.blogspot.co.uk/2013/07/measurements-dac-waveform-peeping-903db.html

My wallet REALLY wishes you didn't post these waveforms. Ah, the Dave! :blink:
 
Apr 26, 2016 at 2:46 PM Post #16,804 of 42,185

wdh777

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I just got a pelican 1020 case which is great. The mojo fits perfectly in half of it leaving room for my Shure 846 and a cable for my iPhone. Although bigger than some cases it allows me to have everything I need for mobile listening in one single case.
 
Apr 26, 2016 at 3:08 PM Post #16,805 of 42,185

Mozartaudio

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Mojo really is an incredible product and for what it can do to such a high level. It can drive HD800 with great authority. Congratulations and Thank you to everybody involved in this project, especially to @Rob Watts. 
 
Apr 26, 2016 at 3:21 PM Post #16,806 of 42,185

Mojo ideas

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Just wearing jeans in that heat hurts... Let alone adding an electronic device. Not fun.
We've design the case with all factors in mind it feels comfortable to carry in hot or cold climates and iyour mojo would be very unlikely to shut down due to its temperature. Our case has a wrist strap which can be looped through your belt if you don't want to carry mojo in your hand or have it in your pocket.
 
Apr 26, 2016 at 3:30 PM Post #16,807 of 42,185

Peter Hyatt

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We've design the case with all factors in mind it feels comfortable to carry in hot or cold climates and iyour mojo would be very unlikely to shut down due to its temperature. Our case has a wrist strap which can be looped through your belt if you don't want to carry mojo in your hand or have it in your pocket.


I can't wait!
 
I recognize that the unit is sturdy and aesthetically pleasing, but psychologically, I'm willing to bet that I am not the only nut-job who wants to 'take good care' of the Mojo, and who brings it everywhere he goes!  
 
Now, if Mython or Relic would only explain what those wave charts mean, I could begin to buy winning lottery tickets to buy DAVE!  
 
Apr 26, 2016 at 4:39 PM Post #16,808 of 42,185

yadoo

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My wallet REALLY wishes you didn't post these waveforms. Ah, the Dave!
blink.gif


Check out Yggdrasil measurements http://www.head-fi.org/t/764787/yggdrasil-technical-measurements/90#post_12536283 ....They are close to Dave 
dt880smile.png
. Dave still outperforms though! Shhhhhh Dave. However, if you consider the price differences, then you will have a good $$$/quality. Unfortunately, these are only measurements. Using the actual two products can be a different story. The only to verify  Yggdrasil's claims is to ask someone who used Yggdrasil and Dave on daily basis, stating their disadvantages before advantages, and comparing the two. 
 
Apr 26, 2016 at 4:40 PM Post #16,809 of 42,185

x RELIC x

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I can't wait!

I recognize that the unit is sturdy and aesthetically pleasing, but psychologically, I'm willing to bet that I am not the only nut-job who wants to 'take good care' of the Mojo, and who brings it everywhere he goes!  

Now, if Mython or Relic would only explain what those wave charts mean, I could begin to buy winning lottery tickets to buy DAVE!  


As I understand it, in simple terms:

Those graphs are waveforms of the output of each device. In a true analogue wave form you have infinite points along the curve and that's what is considered 100% representation of the original analogue performance, what we hear in the real world, live. This is Rob's goal, to reproduce the original analogue performance. His goal of moving toward an infinite Tap length filter is a big part of what gives his DACs an analogue like sound, something that many people just find more musical over 'traditional' digital to analogue reconstruction, even if they can't describe why. With the Dave it certainly seems like he's getting close.

It's a complex issue and many in the industry say that after a certain point with measurements the differences are inaudible. It seems with Rob's filter, and the general public reactions to his DAC designs, that the differences are indeed audible, and favourable, over other implementations. Like Rob has mentioned previously, I feel we grossly underestimate what the brain is capable of deciphering when listening to audio and our measurement devices really just scratch the surface of what we can process (this however is a topic for Sound Science and will easily de-rail this thread)

Example of an analogue waveform on an oscilloscope:



What DACs do is try to reproduce the original analogue waveform based on the sampling rate of the digital file for time samples and the bit depth for voltage amplitude. Here is a rudimentary illustration of a digital sine wave compared to an analogue sine wave:



In simple terms what Rob is doing with his WTA filter is filling in the stair steps to closer match the original analogue performance. With the Mojo and Hugo it's much better than the PCM1795 (a top rate 'off the shelf' DAC) illustrated in the earlier post. With the Dave it is out of the ballpark and incredibly analogue like.

I mean, just look how analogue like that waveform is from the Dave:



Of course there are many other factors to consider besides the waveform. Issues like noise floor modulation and harmonic distortion come to mind when producing an analogue signal from digital, but Rob seems to have taken care of most of these issues with the Dave. Indeed the measurements for THD (0.000015% @2.5Vrms) and noise floor modulation (none measurable) are an indication of the incredible total performance. There are many other factors as well like taking care of RF noise and a host technical hurdles to creating a transparent output. The Mojo and Hugo are good, the Dave is outstanding (according to reports).

But it'll cost you in the ballpark of $13000 to get one, plus $2500 for the gorgeous stand.....
 
Apr 26, 2016 at 4:41 PM Post #16,810 of 42,185

x RELIC x

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Check out Yggdrasil measurements http://www.head-fi.org/t/764787/yggdrasil-technical-measurements/90#post_12536283 ....They are close to Dave :dt880smile: . Dave still outperforms though! Shhhhhh Dave. However, if you consider the price differences, then you will have a good $$$/quality. Unfortunately, these are only measurements. Using the actual two products can be a different story. The only to verify  Yggdrasil's claims is to ask someone who used Yggdrasil and Dave on daily basis, stating their disadvantages before advantages, and comparing the two. 


I've been closely following the Yggy and Dave threads. Although I'm sure it sounds good I'm not interested in the Yggy at this time. :wink_face:
 
Apr 26, 2016 at 5:12 PM Post #16,813 of 42,185

warrior1975

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Question for you guys. Using my phone and the stock player, it can't play certain files, dsd or ape being one. If I hook mojo up to it, will it play then? Or is that a limitation of the stock player? Any idea? Can't test, having issues with my usb port on my phone. Just curious.
 
Apr 26, 2016 at 5:13 PM Post #16,814 of 42,185

x RELIC x

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Question for you guys. Using my phone and the stock player, it can't play certain files, dsd or ape being one. If I hook mojo up to it, will it play then? Or is that a limitation of the stock player? Any idea? Can't test, having issues with my usb port on my phone. Just curious.


It's a limitation of the player being able to decode the format.
 
Apr 26, 2016 at 5:13 PM Post #16,815 of 42,185

Mython

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Question for you guys. Using my phone and the stock player, it can't play certain files, dsd or ape being one. If I hook mojo up to it, will it play then? Or is that a limitation of the stock player? Any idea? Can't test, having issues with my usb port on my phone. Just curious.

 
It's your player software not decoding the content
 
EDIT:  x RELIC x beat me to it
confused_face.gif
 
 
 
Incidentally, some of this post is interrelated with your question, warrior1975
 
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