Chord Mojo(1) DAC-amp ☆★►FAQ in 3rd post!◄★☆
Nov 21, 2015 at 8:25 PM Post #5,567 of 42,765
The unit I had only showed hiss with the JH Angie and could be heard with no input connected or coaxial input connected. Plugging in USB or optical made the hiss go away. My full sized cans didn't hiss. The unit was returned to Chord and fixed. I know the SE846 is more sensitive but there shouldn't really be any hiss.


Out of interest, I spent the afternoon listening to a Hugo (given how impressed I am with the Mojo). I got the same hiss on the Hugo that I get on the Mojo.

According to Rob Watt's post here that's both normal and to be expected. I know the Mojo isn't the Hugo, but it does make me think there's nothing wrong with my Mojo (Inwould expect the Hugo to be the better performer) and the real issue is just that I am able to perceive lower levels of hiss, maybe sound in general, than some others.
 
Nov 21, 2015 at 8:33 PM Post #5,568 of 42,765
Out of interest, I spent the afternoon listening to a Hugo (given how impressed I am with the Mojo). I got the same hiss on the Hugo that I get on the Mojo.

According to Rob Watt's post here that's both normal and to be expected. I know the Mojo isn't the Hugo, but it does make me think there's nothing wrong with my Mojo (Inwould expect the Hugo to be the better performer) and the real issue is just that I am able to perceive lower levels of hiss, maybe sound in general, than some others.


That makes sense. The hiss I had was HIIIISSSSS or SSSHHHHHH, like pink noise, and audible over the music with my IEM so what you are describing is completely different. Thanks for the clarification.

:beerchug:
 
Nov 21, 2015 at 8:56 PM Post #5,569 of 42,765
  So the sound of thru the Mojo is not influenced by the source?
 
Does iPhone 6 Plus + Mojo sound better than AK380 for the price?


What you mean? It performs better by a large margin. The Mojo will have its sound signature no matter the transport that is feeding it. If you like that signature, you will like Mojo. If you do not, you will not. It's as simple as that. The objectively better performer is the Mojo. The subjective appreciation you have of it will depend completely on you.
 
Nov 21, 2015 at 9:20 PM Post #5,570 of 42,765
That makes sense. The hiss I had was HIIIISSSSS or SSSHHHHHH, like pink noise, and audible over the music with my IEM so what you are describing is completely different. Thanks for the clarification.

beerchug.gif


Exactly as mine was - more than the run of the mill hiss....  2 hours 20 minutes left 
frown.gif

 
Nov 21, 2015 at 9:45 PM Post #5,571 of 42,765
JH Roxanne is not the most sensitive iem in the world and I don't hear any form of hiss on 2 of my Mojos. I had one earlier making a hummimg noise whenever connected to a USB charger which was replaced.
 
Nov 21, 2015 at 9:55 PM Post #5,572 of 42,765
I have an issue with my Mojo's USB ports. They are not flush and are mounted at an angle. This means the USB cables stick out at an angle as well. When I searched this thread/forum and other sites it all looks like the USB ports should be straight and flush. The audio is working wonderfully but I am worried that this will cause problems when accessories become available for the Mojo. Has anyone else had this issue? I was planning on bringing it back to get replaced but wanted to check out what everyone here had to say first?
 
 
I took some pictures but can't post directly since I do not have the required permissions so here is an imgur link: http://imgur.com/CHyOzJ2&Ml4Aiyl
 
Nov 21, 2015 at 10:15 PM Post #5,573 of 42,765
I have an issue with my Mojo's USB ports. They are not flush and are mounted at an angle. This means the USB cables stick out at an angle as well. When I searched this thread/forum and other sites it all looks like the USB ports should be straight and flush. The audio is working wonderfully but I am worried that this will cause problems when accessories become available for the Mojo. Has anyone else had this issue? I was planning on bringing it back to get replaced but wanted to check out what everyone here had to say first?


I took some pictures but can't post directly since I do not have the required permissions so here is an imgur link: http://imgur.com/CHyOzJ2&Ml4Aiyl


Not normal.
 
Nov 21, 2015 at 10:24 PM Post #5,574 of 42,765
  I have an issue with my Mojo's USB ports. They are not flush and are mounted at an angle. This means the USB cables stick out at an angle as well. When I searched this thread/forum and other sites it all looks like the USB ports should be straight and flush. The audio is working wonderfully but I am worried that this will cause problems when accessories become available for the Mojo. Has anyone else had this issue? I was planning on bringing it back to get replaced but wanted to check out what everyone here had to say first?
 
 
I took some pictures but can't post directly since I do not have the required permissions so here is an imgur link: http://imgur.com/CHyOzJ2&Ml4Aiyl

 
The port is not totally flushed but should be straight.
 
Nov 21, 2015 at 11:03 PM Post #5,576 of 42,765
So I finally got around to listening to the Mojo. I don't what kind of magic they stuffed in this little thing, but it is amazing. I'm using an iPad Mini, HD600/Cardas with iTunes and Tidal. Couple words describe the sound. Detailed, real, and effortless. Didn't matter the music genre. It all sounded good. I bought the Mojo on an impulse, all the hype. I even cancelled the order once. The Mojo just makes the music sound better. I am so pleased with it. Yes I am gushing. Almost afraid to try higher end headphones and hi-Rez music....
 
Nov 21, 2015 at 11:09 PM Post #5,577 of 42,765
  I have an issue with my Mojo's USB ports. They are not flush and are mounted at an angle. This means the USB cables stick out at an angle as well. When I searched this thread/forum and other sites it all looks like the USB ports should be straight and flush. The audio is working wonderfully but I am worried that this will cause problems when accessories become available for the Mojo. Has anyone else had this issue? I was planning on bringing it back to get replaced but wanted to check out what everyone here had to say first?
 
 
I took some pictures but can't post directly since I do not have the required permissions so here is an imgur link: http://imgur.com/CHyOzJ2&Ml4Aiyl


The USB does not fit flush, yours is about normal. Also from the image I can tell the actual USB does go straight in. The fit is normal. 
 
Nov 21, 2015 at 11:18 PM Post #5,578 of 42,765
The only "hiss" I hear is A) when the music is very quiet, and B) when that is apparently what was recorded originally. I've never been bothered by any such sound during normal playback, except a few bad recordings.

My hypothesis is that the Mojo is so resolving that any background noise is shown, not that the Mojo itself is at fault. If you prefer a system that shows no "noise" no matter what, then move on and find something that makes you happy.

Not being defensive, just my observation.

Cheers and have a great weekend
 
Nov 21, 2015 at 11:34 PM Post #5,579 of 42,765
 
The USB does not fit flush, yours is about normal. Also from the image I can tell the actual USB does go straight in. The fit is normal. 


There does seem to be a small issue with the cables.
 
 
10 Hours done - this Mojo is perfect - no hiss - no hum - crystal clear...  I listen to a lot of recordings done in the 70's and 80's - there's hiss, and there's hiss.
 
Nov 21, 2015 at 11:50 PM Post #5,580 of 42,765
+1

There should be zero hiss on this unit - I also believe that my unit that had the hiss, probably exhibited some other sound anomalies due to the flaw. They could be so subtle as not to be immediately noticed, but ultimately the sound would not be representative of the top drawer sound this unit was designed to reproduce...
Are we absolutely sure that the hiss heard isn't the blood flow through the ears vessels?

I am a real OCD character when it comes to noise, was one of the first to declare hiss on the Hugo (much to people's derision) I also declared it on the ZX2, but with the mojo whilst I do pick up a noise when plugging my Layla's into my ears, I think that is now more to do with occlusion than anything else, as is easy to replicate without the mojo at hand...

What are the ohm and efficiency ratings of affected IEMs?

Oh, and going back to cable RFI / EMI, yes, that is one definite thing that does affect Layla and mojo performance, the bass adjuster module sucks up noise like a vacuum sucks up dust...
 

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