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Chord Mojo DAC-amp ☆★►FAQ in 3rd post!◄★☆ - Page 1929

post #28921 of 31334
Quote:
Originally Posted by jwbrent View Post

I wonder if Chord can update the Mojo with a crossfade feature? I like how the end of a song blends into the beginning of a song when using crossfade in other apps, especially when playing from a playlist.

If Chord can do this, I would think the safeguard .5 second mute feature would no longer be so disquieting to me.

There is no user access for FW updates. It would require opening up the case to access the JTAG header, a Xilinx programming pod, a copy of Vivado, the bitstream, and the part number for the platform flash to program. It's not something the average consumer would have access to or be able to do.
post #28922 of 31334
Quote:
Originally Posted by maxh22 View Post

Has anyone else done any testing comparing MQA tracks to their Hifi counterparts? I have some of my own impressions and they are strongly leaning towards the MQA version.

There was some analysis done on it that was posted a while back in sound science. You might try looking there.
post #28923 of 31334
So is Poly gobba sound just fine on WiFi? No RF? Or is this guesswork. Because if I say that Poly on WiFi will sound bad.... Well that's just guessing like some of you a few saying is gonna sound good.... Pfffft.

I just don't see it beating a wire.

If you as much put a phone close to the Mojo (even if that device is not its transport) while the phone is connected to WiFi, mojo flips out....
post #28924 of 31334
Thread Starter 
Quote:
Originally Posted by NaiveSound View Post

So is Poly gobba sound just fine on WiFi? No RF? Or is this guesswork. Because if I say that Poly on WiFi will sound bad.... Well that's just guessing like some of you a few saying is gonna sound good.... Pfffft.

I just don't see it beating a wire.

If you as much put a phone close to the Mojo (even if that device is not its transport) while the phone is connected to WiFi, mojo flips out....

 

 

None of us, except for the Chord team and their consultants, have actually heard Poly, so only they know what RF issues may have been encountered and dealt with, but one thing I do know is that when you hook-up a smartphone to Mojo, the USB cable is capable of acting as an antenna, and carrying stray RF into the analogue sections of Mojos circuitry (and many other DACs suffer similar vulnerability). Additionally, the smartphone, in such a scenario, is transmitting RF directly adjacent to Mojo.

 

 

Poly will be engaging in a certain amount of RF dialogue, but, when hooked-up to a Mojo, at least it won't have a 4" USB cable hanging out of it, acting as an antenna.

 

 

I'm as interested to hear Poly as anyone else...

post #28925 of 31334
Quote:
Originally Posted by Mython View Post
 

one thing I do know is that when you hook-up a smartphone to Mojo, the USB cable is capable of acting as an antenna, and carrying stray RF into the analogue sections of Mojos circuitry (and many other DACs suffer similar vulnerability). Additionally, the smartphone, in such a scenario, is transmitting RF directly adjacent to Mojo.

 

 

Hmmm. I am a bit confused as I contemplate my purchase of a Mojo.  I will be using it with an iPhone - as many others currently do.  Are you saying that the Mojo suffers from stray RF which will be audible?

post #28926 of 31334
Thread Starter 
Quote:
Originally Posted by buzzlulu View Post
 
Quote:
Originally Posted by Mython View Post
 

one thing I do know is that when you hook-up a smartphone to Mojo, the USB cable is capable of acting as an antenna, and carrying stray RF into the analogue sections of Mojos circuitry (and many other DACs suffer similar vulnerability). Additionally, the smartphone, in such a scenario, is transmitting RF directly adjacent to Mojo.

 

 

Hmmm. I am a bit confused as I contemplate my purchase of a Mojo.  I will be using it with an iPhone - as many others currently do.  Are you saying that the Mojo suffers from stray RF which will be audible?

 

MANY DACs are vulnerable to RF - Mojo is not an exception.

 

One has to be pragmatic about this - smartphones transmit a great deal of RF.

 

However, many people happily use Mojo, with a ferrite choke fitted to their microUSB cable.

 

https://www.amazon.com/stardrift-10-Pack-Diameter-Ferrite-Filter/dp/B015RDVGDE

post #28927 of 31334
Quote:
Originally Posted by buzzlulu View Post

Hmmm. I am a bit confused as I contemplate my purchase of a Mojo.  I will be using it with an iPhone - as many others currently do.  Are you saying that the Mojo suffers from stray RF which will be audible?

In my experience.... I had a phone strictly as a transport for mojo.
When I fed mojo digital signal via a USB to usb OTG cable I had to have a cable of over 12 inches so I can put mojo and the phone transport away from. Mojo about a foot to not hear any RF while I was streaming over WiFi (on the said phone)

Now... If I just got close with my other phone to the Mojo... It would cause RF ( even tho this personal phone (() not the transport phone (() was not wired to mojo)

RF gas been the only complain of mine about mojo...

With that said, I enjoy it enough to deal with this annoying issue but keeping phone transport (and any other wifi connected device) as far away from mojo as I can.

This may or may not be a problem with other dacs. But it is with this one.

Now this Poly is gonna be kissing the Mojo while connected to WiFi and I'm curious if the WiFi RF is gonna be a pest... But chord doesn't say much about Poly and RF.

Maybe it a casino at 600$ risk
post #28928 of 31334
Quote:
Originally Posted by Mython View Post

MANY DACs are vulnerable to RF - Mojo is not an exception.

One has to be pragmatic about this - smartphones transmit a great deal of RF.

However, many people happily use Mojo, with a ferrite choke fitted to their microUSB cable.

https://www.amazon.com/stardrift-10-Pack-Diameter-Ferrite-Filter/dp/B015RDVGDE

So I just buy that and put it around my USB cable and that's it? Or is there something else... This is a super big deal for me, I csnt wait to get rid of RF
post #28929 of 31334
Quote:
Originally Posted by maxh22 View Post
 

Has anyone else done any testing comparing MQA tracks to their Hifi counterparts? I have some of my own impressions and they are strongly leaning towards the MQA version.

 

I'm listening to Leonard Cohen's album, "10 New Songs," right now on my Raidhos and it sounds really really good. His sonorous voice has my room harmonizing with the music. :D

post #28930 of 31334
Thread Starter 
Quote:
Originally Posted by NaiveSound View Post
 
Quote:
Originally Posted by Mython View Post

MANY DACs are vulnerable to RF - Mojo is not an exception.

One has to be pragmatic about this - smartphones transmit a great deal of RF.

However, many people happily use Mojo, with a ferrite choke fitted to their microUSB cable.

https://www.amazon.com/stardrift-10-Pack-Diameter-Ferrite-Filter/dp/B015RDVGDE

So I just buy that and put it around my USB cable and that's it? Or is there something else... This is a super big deal for me, I csnt wait to get rid of RF

 

 

It can depend on what network you have your smartphone (what frequency that network uses), how far you are from the nearest cell transmitter(s), etc.

 

Some people find an RF choke will work very effectively, but there are almost always exceptions to every rule - for example, some people live in poor reception areas, where their smartphone may have to ramp-up its RF output, and this obviously can make RF interference more probable.

 

Again, this is not limited to Mojo - stray RF is a problem with many similar devices.

post #28931 of 31334
Thread Starter 
Quote:
Originally Posted by jwbrent View Post
 
Quote:
Originally Posted by maxh22 View Post
 

Has anyone else done any testing comparing MQA tracks to their Hifi counterparts? I have some of my own impressions and they are strongly leaning towards the MQA version.

 

I'm listening to Leonard Cohen's album, "10 New Songs," right now on my Raidhos and it sounds really really good. His sonorous voice has my room harmonizing with the music. :D

 

 

If only he could sing in tune! :tongue:   (great lyricist, though)

post #28932 of 31334

A good/clear read here on Tidal MQA  http://www.digitalaudioreview.net/2017/01/mqa-tidal-where-are-we-now/  which I happen to be listening to now via laptop to my Mojo. Very nice quality.

 

 

Opps, just realised link was posted in thread 4 hrs ago. Hard to keep up with all the treads I'm reading :rolleyes: 


Edited by psikey - 1/11/17 at 1:36pm
post #28933 of 31334
The RFI/EMI issue is with many other portable DAC/amps and is difficult to isolate with external wireless transmission, the external sources being from cellular networks or weak WiFi transmission. Mojo is not alone in this and if you don't believe me just read other portable DAC/amp threads.

I've been silently reading all the posts about the Poly and personally I feel this has gone out of hand. Look, it's a front end to the Mojo with a mSD slot for local music with wireless smartphone/PC control - in this scenario only the playback control is wireless and should not be an issue at all for RFI/EMI. It also seems to act as a streamer from wireless sources (again, controlled from a smartphone/PC). The RFI/EMI in this scenario I am not sure about as Chord has not specified much about what shielding has been done to protect the audio circuit in the Mojo from the Poly, but I imagine they've done some testing.

It's the streamer portion that we are unsure of and quite honestly all the guessing in world is not going to be helpful. The S/N ratio on the Mojo and Poly threads is extremely high since the announcement and I suggest we all sit back and wait for actual information. Everyone and their cousin is posting the same thing without information making the threads unwieldy and unproductive. Let's wait for Jude's video, or more information from Chord, about the specifics and use scenarios. I mean, how many posts do we need to read about the same round robin comments regarding displeasure of price and guesses about functionality (not to mention the numerous off topic posts and personal critiques). I for one am tired of the noise in these threads without facts. I'm sure Chord has got the message loud and clear that we want more info already. I suggest patience as the product is still a ways off from being available.
post #28934 of 31334
Quote:
Originally Posted by NaiveSound View Post


In my experience.... I had a phone strictly as a transport for mojo.
When I fed mojo digital signal via a USB to usb OTG cable I had to have a cable of over 12 inches so I can put mojo and the phone transport away from. Mojo about a foot to not hear any RF while I was streaming over WiFi (on the said phone)

Now... If I just got close with my other phone to the Mojo... It would cause RF ( even tho this personal phone (() not the transport phone (() was not wired to mojo)

RF gas been the only complain of mine about mojo...

With that said, I enjoy it enough to deal with this annoying issue but keeping phone transport (and any other wifi connected device) as far away from mojo as I can.

This may or may not be a problem with other dacs. But it is with this one.

Now this Poly is gonna be kissing the Mojo while connected to WiFi and I'm curious if the WiFi RF is gonna be a pest... But chord doesn't say much about Poly and RF.

Maybe it a casino at 600$ risk

 

Can be solved relatively easily with the ferrite ring around the cable & thin sheet iron in case between close coupled phone & Mojo. I had interference over Wifi & 3G and unusable over 4G. Once I used the iron all totally gone.

 

 

 

 

And for some reason with my new Penon Pure Silver USB OTG I don't seem to need the ferrite ring 

 

 

 

As a final comment, I had no interference whatsoever with the Dragonfly Red. It just worked other than the Android volume issue for me (and sound quality not quite as good as Mojo but really great otherwise)


Edited by psikey - 1/11/17 at 2:00pm
post #28935 of 31334
Quote:
Originally Posted by Mython View Post
 

 

MANY DACs are vulnerable to RF - Mojo is not an exception.

 

One has to be pragmatic about this - smartphones transmit a great deal of RF.

 

However, many people happily use Mojo, with a ferrite choke fitted to their microUSB cable.

 

https://www.amazon.com/stardrift-10-Pack-Diameter-Ferrite-Filter/dp/B015RDVGDE


Thanks for this.

 

Still confused about the Mojo.  I am also participating in the Focal Elear thread and multiple posters are claiming that the Elears, being an easy to drive hp, sound quite good directly out of iPhones.  Some are claiming that there is not much of a difference between running them directly out of the iPhone vs. a Mojo - minimal difference.

 

I am now really confused.  There is universal aclaim for the Mojo - yet some say not much of an improvement  - at least with Focal Elears.

 

I have heard similar with regards to the Dragonfly vs. Mojo

 

Is it really that dependent on the actual headphone i.e. those which are easy to drive do not benefit that much from something like a Mojo compared to direct out of an iPhone?  

 

In the case of my iPhone 7 - which eliminated the headphone jack and only sends a digital signal out of the lighting port - I would hope that a $600 Mojo provides better DAC capabilities than the supplied $9 Apple dongle with built in DAC and amp.

 

Please help me out on this one.

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