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JDS Labs C5/C5D (pg96) portable amp/amp+DAC appreciation + discussion thread - Page 168

post #2506 of 2701
Quote:
Originally Posted by r010159 View Post
 
Quote:
Originally Posted by luisdent View Post


Just because the hub works with the odac does not mean it will work with every other device. It may not be the hub, but the fact tgat it works with the odac doesn't prove anything. In fact, if i'm not mistaken you're saying the c5d works when you're not using the hub. That more likely rules out the c5d as a problem if that were the case.

Not to be a pain, but could you clearly list all of the exact setups in which it doesn't work as well as the setups in which it does work? Maybe we can figure it out? Maybe it is the adapter, but i'd like to go over all the situations if it isn't too much bother...

John might have other clues as well, but he seems to also think it isn't the c5d. However he would test it for you if you want to be sure. But i'm guessing it's the hub or adapter personally..

 

I had this same problem well before I used this hub. But I will not use the hub this time.  In order to simplify this, I am using my iPhone 4S with its  30-pin CCK through the USB cable I have been using with the ODAC for months, out to the C5D instead of the ODAC. I am not using the original USB cable, Lightning CCK, or the iPad. This setup does not work. So all I do is turn the C5D on and off and on and off. Sometimes audio comes through to my headphones, but most of the time it does not and plays from the phone. I have not changed or done a thing during this test other than toggle the power switch. I then substitute the iPhone and its 30-pin CCK with an  iPad and its Lightning CCK . I have the same problem that is intermittently solved in the same way, the toggling of the  power switch several or more times.  I then use the C5D as a DAC/amp for my Mac mini. In this case it works several times in a row. I am listening to it as I write this. The only difference is I am not using either CCKs, but I am using the same USB cable. 

 

Bob Graham

 

So to be clear, it works with the usb cable only to the mac mini and no failures?

post #2507 of 2701

Any suggestions on a good carry case or pouch? Best I could find so far is a hard carry case for a WD My Passport external hard drive (http://www.amazon.com/AmazonBasics-Hard-Carrying-Passport-Essential/dp/B003LSTD38/ref=pd_cp_e_0) but it's still bigger than I would like.  Pouch or sleeve would also be acceptable.

 

Thanks!


Edited by s0ckpupp3t - 5/12/14 at 10:05pm
post #2508 of 2701
Quote:
Originally Posted by luisdent View Post
 

 

So to be clear, it works with the usb cable only to the mac mini and no failures?

 

Yes, it failed only once out of 30 times for some reason. But this may be the fault of the audio player. The player did not recognize the C5D that one time. Sometimes I unplugged the USB cable and plugged it back in. I turned the unit off and on. It still worked.

 

Bob


Edited by r010159 - 5/14/14 at 10:28am
post #2509 of 2701
What you also should check is if your problem applies to all the ports of the hub. A lot of hubs have a poor port layout based on chips that are wired in series. Debian based deveices often have problems with these as well, some of the ports would work some won't. I can imagine that a simmilar issue could happen with ios products. Another question would be at which battery switch position are you trying to use it? Although you are using a (powered) hub the two deveices are still not galvanically separated on the usb power poles.
post #2510 of 2701
I have stopped using the hub. It just complicated the setup adding one more variable to the picture. As to why this works with the Mac mini but not an iDevice, perhaps the driver on the Mac mini is more robust.
post #2511 of 2701

John and I have agreed on a plan. He will send my out a unit that is using adaptive mode instead of asynchronous mode USB transfers. This is his idea. It also will be a new unit, so this should eliminate one of the last major variables in the picture. This part appeals to me.


John sure does back his products, where there is no arguing or pleading or dozens of e-mails later with no results...what a positive experience for me. This is why I purchased both the O2/ODAC and the C5D from his company.


Edited by r010159 - 5/14/14 at 10:33am
post #2512 of 2701

any comparisons available between the dx90 and the c5d, regarding sound quality??

post #2513 of 2701

The Koss Porta Pro bag works pretty well.

 

Quote:

Originally Posted by s0ckpupp3t View Post
 

Any suggestions on a good carry case or pouch? Best I could find so far is a hard carry case for a WD My Passport external hard drive (http://www.amazon.com/AmazonBasics-Hard-Carrying-Passport-Essential/dp/B003LSTD38/ref=pd_cp_e_0) but it's still bigger than I would like.  Pouch or sleeve would also be acceptable.

 

Thanks!

post #2514 of 2701

Just posted a new short review:

post #2515 of 2701
Here is an update. It is not the C5D. I was flummoxed, particularly since John set it up in an adaptive USB transfer mode. So I thought "out of the box" and saw both USB cables that I tested with were of the same type, with the cylindrical object on one end. So I purchased another cheap USB cable. This did not work with the iPhone. So I thought I might as well try the iPad with the Lightening connector. Guess what? It worked. I have been testing it trying to see if it will stop working. It seems to be working fine right now. So far it has worked a couple dozen times in a row with me trying to get it not to work.

I then connected the original cable that I was trying to use and it continued to work. I do not understand this. I suspect that something may have been wrong with the interface circuitry with the Lightening socket on the iPad. Perhaps the new cable allowed the circuitry to initialize and operate correctly. I do not know. This does not make much sense to me. This has rarely happened to me. But then there is the iPhone that did not work either. I am going to work on this aspect of my problems. But first the iPod Touch.

The "Outer Limits". Spooky. LOL
Edited by r010159 - 5/16/14 at 7:20pm
post #2516 of 2701
Quote:
Originally Posted by r010159 View Post

Here is an update. It is not the C5D. I was flummoxed, particularly since John set it up in an adaptive USB transfer mode. So I thought "out of the box" and saw both USB cables that I tested with were of the same type, with the cylindrical object on one end. So I purchased another cheap USB cable. This did not work with the iPhone. So I thought I might as well try the iPad with the Lightening connector. Guess what? It worked. I have been testing it trying to see if it will stop working. It seems to be working fine right now. So far it has worked a couple dozen times in a row with me trying to get it not to work.

I then connected the original cable that I was trying to use and it continued to work. I do not understand this. I suspect that something may have been wrong with the interface circuitry with the Lightening socket on the iPad. Perhaps the new cable allowed the circuitry to initialize and operate correctly. I do not know. This does not make much sense to me. This has rarely happened to me. But then there is the iPhone that did not work either. I am going to work on this aspect of my problems. But first the iPod Touch.

The "Outer Limits". Spooky. LOL
There is usually a simple cause, but sometimes it gets overlooked...

Btw, those round things on your cables are ferrite cores or beads. They're used to filter out unwanted noise/interference.
post #2517 of 2701
Quote:
Originally Posted by luisdent View Post

There is usually a simple cause, but sometimes it gets overlooked...

Btw, those round things on your cables are ferrite cores or beads. They're used to filter out unwanted noise/interference.

Yes, a simple cause, but not so easy to narrow down in this case.
post #2518 of 2701
Quote:
Originally Posted by r010159 View Post

Quote:
Originally Posted by luisdent View Post

There is usually a simple cause, but sometimes it gets overlooked...

Btw, those round things on your cables are ferrite cores or beads. They're used to filter out unwanted noise/interference.

Yes, a simple cause, but not so easy to narrow down in this case.
Indeed. Does the audio play through your iPad itself even when the c5d is connected to it?
post #2519 of 2701
Quote:
Originally Posted by luisdent View Post

Indeed. Does the audio play through your iPad itself even when the c5d is connected to it?

Yes, it did up until this point in time. The same with the iPhone still even with the new cable. That is why I am perplexed. The iPad now has been working for two days without a problem. Since I do not know specifically what has caused this problem, other then something to do with the cable and/or the lLightening socket on the iPad, I am still concerned that the problem may happen again. John told me to take my time checking this out.

Welcome to the Twighlight Zone. LOL
Edited by r010159 - 5/17/14 at 2:02pm
post #2520 of 2701
Quote:
Originally Posted by r010159 View Post

Quote:
Originally Posted by luisdent View Post

Indeed. Does the audio play through your iPad itself even when the c5d is connected to it?

Yes, it did up until this point in time. The same with the iPhone still even with the new cable. That is why I am perplexed. The iPad now has been working for two days without a problem. Since I do not know specifically what has caused this problem, other then something to do with the cable and/or the lLightening socket on the iPad, I am still concerned that the problem may happen again. John told me to take my time checking this out.

Welcome to the Twighlight Zone. LOL
If i understand correctly, that rules out the c5d as the issue. If you're hearing audio from the iDevices while the c5d is connacted, that means the iDevice hasn't detected anything to switch the output to the cck.

Per john, the c5d simply accepts incoming data if i'm not mistaken. Therefore, if i understand properly, the ipad would never know that the c5d specifically is connected. Rather, it probably detects the cck. This would indicate a problem with the cck or ipad. As your iphone does the same thing, tgat makes me suspect the cck, even if you've tried more than one. Maybe the connections aren't firm enough? Are you ccks apple brand? Do they feel tight? Are they the version with the cable attached or just the small adapter?
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