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JDS Labs C5/C5D (pg96) portable amp/amp+DAC appreciation + discussion thread - Page 116

post #1726 of 2884
Quote:
Originally Posted by jseaber View Post
 

 

C5D's firmware reads USB voltage even in self-power mode, so the DAC can potentially shut off when there's a cable or power disturbance. The assumption was that the DAC should remain off to conserve power when a USB cable is disconnected. There's some extra logic to avoid dropouts, but this would not help with large variations in USB voltage.

 

The 2nd batch of C5Ds arrive today and we've updated firmware to force the DAC to remain on even when USB voltage behaves unexpectedly, including complete voltage dropouts. So unless the data drops out, the DAC will not turn off. Please email us if you have trouble again.


Thanks John, glad to hear fast response from you and your team. 
I am assuming battery is the main feature that can explain everything relate to power issue and connecting USB to PC is all about data transfer and ground sharing. 
 

post #1727 of 2884
Quote:
Originally Posted by palermo View Post
 


Thanks John, glad to hear fast response from you and your team. 
I am assuming battery is the main feature that can explain everything relate to power issue and connecting USB to PC is all about data transfer and ground sharing. 
 

 

That's right. Only D+, D-, and GND matter in self-power mode.

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post #1728 of 2884
Quote:
Originally Posted by jseaber View Post
 

 

That's right. Only D+, D-, and GND matter in self-power mode.

Hi John,

 

Even though Ill get my C5D today its actually one of the first ones after fixing the initial issue (A friend got it for me in the states).

Do I have to update the arduino 'firmware'?

 

thnx

post #1729 of 2884
Quote:
Originally Posted by luisdent View Post


Also if this is the same user, he wasn't a fan of the c5 and says the c5d is more congested. So it sounds worse than an amp he already didn't like, but it's good as a dac/amp combo? The combo should only be as good as its weakest link.

So just take that logic into mind. I'll be glad to post my impressions vs. the c5 as soon as i have a chance to hear the c5d. Not sure when that will be as i don't really need a dac at the moment..,

 

It does seem possible. The impact of the dac part on the amp shouldn't be underestimated. The result of using both at the same time can very well be different than using the amp solo. Two different people who have A/B tested both units have confirmed this by now.

post #1730 of 2884
Quote:
Originally Posted by Varoudis View Post
 

Hi John,

 

Even though Ill get my C5D today its actually one of the first ones after fixing the initial issue (A friend got it for me in the states).

Do I have to update the arduino 'firmware'?

 

thnx

 

@Varoudis: I see no reason to update firmware. The original code gives slightly longer run time in amplifier-only mode. The current code, v1.2.0, is standard for C5Ds shipping this week, and an optional update to first batch C5Ds. It's not worth changing unless you're using a USB port that drops below 4.1V and then above 4.9V in half a second (nominal voltage being 5.0V). Your USB ports really shouldn't do that!

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post #1731 of 2884

I just have a question of interest. I got my C5 about a week ago and I've listened a lot to it and it's great. 

 

Is the bass boost supposed to have that much of an increase? I can't even imagine bassheads listening to that much bass, maybe they do? I don't know how many db and that kind of stuff, but it is a lot. The normal mode is great though so that's where I listen.

post #1732 of 2884
Quote:
. Two different people who have A/B tested both units have confirmed this by now.

This doesn't change anything. 30 people can test it. This is even more likely to cause the next tester to hear something because they're expecting to. As i already described...

And in my experiences a dac is usually the smallest change in the chain of devices if everything you have is at least decent. Not to say this isn't a great dac, but that if you already have a decent dac like an ipod, a better dac will only be a small change.

The benefit of the c5d is that no matter what you connect it to you're going to know you have reference sound. But c5 with an ipod should sound very similar if not identical to the c5d and an ipod. Not a large change as was described. The impedance with a very touchy iem would probably cause more change in sound than the dac itself... But that's another topic and not directly indicative if the "sound quality" of either vs. the other except in achieving a target frequency response if you iem is sensitive to impedance.
Edited by luisdent - 12/20/13 at 9:24am
post #1733 of 2884
Quote:
Originally Posted by goswser View Post

I just have a question of interest. I got my C5 about a week ago and I've listened a lot to it and it's great. 

Is the bass boost supposed to have that much of an increase? I can't even imagine bassheads listening to that much bass, maybe they do? I don't know how many db and that kind of stuff, but it is a lot. The normal mode is great though so that's where I listen.
The bass boost works well with the AKG K 701, especially for gaming, watching movies, enjoying electronic music.

Likewise, it's beneficial to have while mobile listening considering the bass, and especially the sub-bass, is the first to disappear with background noise around you (hence why noise cancelling headphones usually have noise cancelling features for bass frequencies, so you can hear that part better).
post #1734 of 2884
Quote:
Originally Posted by luisdent View Post


This doesn't change anything. 30 people can test it. This is even more likely to cause the next tester to hear something because they're expecting to. As i already described...

And in my experiences a dac is usually the smallest change in the chain of devices if everything you have is at least decent. Not to say this isn't a great dac, but that if you already have a decent dac like an ipod, a better dac will only be a small change.

The benefit of the c5d is that no matter what you connect it to you're going to know you have reference sound. But c5 with an ipod should sound very similar if not identical to the c5d and an ipod. Not a large change as was described. The impedance with a very touchy iem would probably cause more change in sound than the dac itself... But that's another topic and not directly indicative if the "sound quality" of either vs. the other except in achieving a target frequency response if you iem is sensitive to impedance.

 

Well, why don't you do the same test and report back ;)

post #1735 of 2884
Quote:
Originally Posted by goswser View Post
 

I just have a question of interest. I got my C5 about a week ago and I've listened a lot to it and it's great. 

 

Is the bass boost supposed to have that much of an increase? I can't even imagine bassheads listening to that much bass, maybe they do? I don't know how many db and that kind of stuff, but it is a lot. The normal mode is great though so that's where I listen.

The C5's bass boost is +6.5 dB @80Hz. IMO it's a little too much for sensitive IEMs but you might want to turn it on if you use the C5 with orthordynamic or high impedance dynamic headphones due to its low output power.

post #1736 of 2884
May I ask if anybody has tried this amp on se846 and how was the experience ?

Thanks
post #1737 of 2884
Quote:
Originally Posted by Ultrainferno View Post

Quote:
Originally Posted by luisdent View Post

This doesn't change anything. 30 people can test it. This is even more likely to cause the next tester to hear something because they're expecting to. As i already described...


And in my experiences a dac is usually the smallest change in the chain of devices if everything you have is at least decent. Not to say this isn't a great dac, but that if you already have a decent dac like an ipod, a better dac will only be a small change.


The benefit of the c5d is that no matter what you connect it to you're going to know you have reference sound. But c5 with an ipod should sound very similar if not identical to the c5d and an ipod. Not a large change as was described. The impedance with a very touchy iem would probably cause more change in sound than the dac itself... But that's another topic and not directly indicative if the "sound quality" of either vs. the other except in achieving a target frequency response if you iem is sensitive to impedance.

Well, why don't you do the same test and report back wink.gif
I plan to. :-)
post #1738 of 2884
Quote:
Originally Posted by luisdent View Post

The impedance with a very touchy iem would probably cause more change in sound than the dac itself... But that's another topic and not directly indicative if the "sound quality" of either vs. the other except in achieving a target frequency response if you iem is sensitive to impedance.

Same reason I got C5D instead of C5 even if I only use the amp most of the time
post #1739 of 2884

Thanks @jseaber this is top quality!

 

 

 

 

Sorry for the 'oldy' decor Im in grandpars old place.

 

:)

 

bass boost it priceless!

post #1740 of 2884
Quote:
Originally Posted by goswser View Post
 

Is the bass boost supposed to have that much of an increase? I can't even imagine bassheads listening to that much bass, maybe they do? I don't know how many db and that kind of stuff, but it is a lot. The normal mode is great though so that's where I listen.

 

Really just depends on the headphones. C5 boost is nice on Senn 600s but not needed on more sensitive IEMs or on M-100s. It's what sounds good to you after all.

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