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JDS Labs C5/C5D (pg96) portable amp/amp+DAC appreciation + discussion thread - Page 56

post #826 of 2628
Quote:
Originally Posted by audionewbi View Post

As much as I like the digital volume control on C5 I do like a large volume knob. I dont listen to music that low and I never had balance problem with any of my amp.

As far as the gain goes I was wondering would it be possible to have a three gains setting progammed on C5?

Quote:
Originally Posted by miceblue View Post

But that is precisely why I like the C5, hahaha. It has a very pocket-friendly interface. The important things are where they should be, in my opinion. One improvement I have for the C5 is that the potentiometer stick out a little more since I find it hard to adjust in my pocket sometimes (or maybe it's just due to my long fingernails....). Once I do get access to the potentiometer on the other hand, volume and gain adjustments are really smooth.

 

And to bring this up again, another improvement would be a gain toggle LED indicator.

I think it would be possible, but the gain is not changeable I believe. There would just be some added programming logic such as setting a gain integer (1, 2, or 3) for the different gain toggles.

 

That being said, I still haven't gotten the drivers on Windows nor Mac to work with the SparkFun pocket AVR programmer.

 

As for volume control, yes I too like the larger volume knobs, but I still have channel imbalance problems with the O2 even with 1.0x gain on the fairly insensitive K 701's. I'm listening to some music at the moment and the volume knob on the O2 is at the ~7 'oclock position, which is plenty loud (maybe too loud) for me. Yes, this is in the channel imbalance region, and yes this is one of the many reasons why I prefer the C5 for quiet home listening.


Edited by miceblue - 4/7/13 at 10:00pm
post #827 of 2628
Quote:
Originally Posted by gkanai View Post

 

I have the same O2 and ODAC you do. And the C5.

 

I'm getting an AudioQuest DragonFly and an HRT microStreamer in the next week or two and will try to do a test between them all (ODAC/O2, ODAC/C5, and then the DragonFly and the microStreamer.)

 

The DragonFly and the microStreamer are both below $300 and should be in your considerations.

I am  considering the new Meridian Explorer,  and  Dragonfly anymore.

What do you think?

post #828 of 2628
Quote:
Originally Posted by jseaber View Post

 

Bass boost of C5 is actually stronger. Neither amp's bass boost curve is centered at 80Hz; c421's "peak" was below 80Hz. You can find the curve on our release article.

 

Thanks John, that's good info.  Do you have a similar graph for the c421/2227 to compare?  Just curious.

post #829 of 2628

Today I was doing some comparisons between the amps and headphones I own, and I thought I should post some impressions here.

 

iPhone 4S -> FiiO L3 -> O2 or C5 -> Shure SRH940

 

 

This time, listening with the SRH940, which I haven't done before, the C5's more fatiguing treble (aggressive?) was more apparent to me in comparison to the O2. Cymbals had a more prominent presence in the rock tracks I listened to ("tss" sounds from the cymbals were more sizzly to me), and the bass wasn't as punchy (bass pedals didn't have as much "kick" or authority).

 

In terms of synergy, I think the O2 would probably be a better choice, but the C5 isn't too shabby. C5 still wins hands down for portability and pocket-friendliness.

 

 

*sigh* I still need to do a proper level-matching between the C5 and O2 too. I have access to high-quality multimeters at school, but I just need to find the time to sit down and have a careful listening session.


Edited by miceblue - 4/9/13 at 11:58pm
post #830 of 2628
Thread Starter 
I also found the treble of the C5 a little brighter than the O2
post #831 of 2628
Quote:
Originally Posted by Mutnat View Post

 

Thanks John, that's good info.  Do you have a similar graph for the c421/2227 to compare?  Just curious.

 

Previously measured, yes, but can't seem to find the screenshot. Will add that to my to-do benchmarking list...

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post #832 of 2628
Quote:
Originally Posted by jseaber View Post

Quote:
Originally Posted by Mutnat View Post

 

Thanks John, that's good info.  Do you have a similar graph for the c421/2227 to compare?  Just curious.

 

Previously measured, yes, but can't seem to find the screenshot. Will add that to my to-do benchmarking list...

Did you ever find a way to do benchmark tests with a 32-ohm load? I think there are a good handful of people interested in seeing benchmarking results with this load.

post #833 of 2628
Quote:
Originally Posted by miceblue View Post

Did you ever find a way to do benchmark tests with a 32-ohm load? I think there are a good handful of people interested in seeing benchmarking results with this load.

Yes, an impedance adapter is on my desk (as of yesterday). Benchmarks to follow.

 

Edit: 32-ohm specs posted.


Edited by jseaber - 4/11/13 at 10:46am
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post #834 of 2628
Quote:
Originally Posted by jseaber View Post

Quote:
Originally Posted by miceblue View Post

Did you ever find a way to do benchmark tests with a 32-ohm load? I think there are a good handful of people interested in seeing benchmarking results with this load.

Yes, an impedance adapter is on my desk (as of yesterday). Benchmarks to follow.

Awesome, that's great to hear! :D

post #835 of 2628
Quote:
Originally Posted by JakeJack_2008 View Post

I am  considering the new Meridian Explorer,  and  Dragonfly anymore.

What do you think?

 

I'm going to wait until I have the HRT microStreamer and then do a review of all of them (microStreamer, ODAC/C5, ODAC/O2, DragonFly).

post #836 of 2628
Quote:
Originally Posted by gkanai View Post

I'm going to wait until I have the HRT microStreamer and then do a review of all of them (microStreamer, ODAC/C5, ODAC/O2, DragonFly).

cant wait for that too biggrin.gif cannot decide between odac, dragonfly, microstreamer
post #837 of 2628

Have been pairing my C5 w/ iPod for a few days now, really love the sound. Yesterday I got a HM603, my very first HM player. Its sound was pretty disappointing when compared w/ iPod+C5 combo. I used a pair of RS1 for the test. After a couple of hours ABx, I liked the iPod+C5 combo a lot more than HM603's headphone out. Almost gave up on this first HM player I've ever had, decided to pair HM603 together with C5 and see how. Man, this combo sounded so much better than iPod+C5! I couldn't help but listening some of my favorite musics until 2am plus :D Oh yeah, I can wear Grados for a whole day w/o any problem, I feel they are the most comfortable headphones.

 

HM603+C5+RS1 combo is just pure musical, can't imagine this can get any better. Now I guess I understand why some guys dislike HM's players, while some love them. Same goes to the different reviews. 


Edited by fengwei007 - 4/11/13 at 3:02am
post #838 of 2628
There is a problem with charging with my S3 battery mod which I have manage to solve but the risk is high so
I have updated my post #525 on page 35 to include a warning on the battery mod just in case some users decided to try it.
post #839 of 2628
Quote:
Originally Posted by rckyosho View Post

There is a problem with charging with my S3 battery mod which I have manage to solve but the risk is high so
I have updated my post #525 on page 35 to include a warning on the battery mod just in case some users decided to try it.

 

Someone emailed us about this on Monday. C5 uses a BQ24075, which expects a 10k NTC input to its temperature monitoring pin (white wire). Rather than swap entire battery control boards, you could try an external NTC or even a fixed 10k resistor (at your own risk, of course).


Edited by jseaber - 4/11/13 at 7:37am
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post #840 of 2628
Quote:
Originally Posted by jseaber View Post

 

Someone emailed us about this on Monday. C5 uses a BQ24075, which expects a 10k NTC input to its temperature monitoring pin (white wire). Rather than swap entire battery control boards, you could try an external NTC or even a fixed 10k resistor (at your own risk, of course).

Thanks John that's good to know.So do I still need to connect the temperature monitoring pin(white wire) to the S3 battery "T" pinout with a 10k thermistor/resistor or just to the C5  battery temperature input alone will do? Anyway I will try this once I get hold of a 10k thermistor/resistor to see if it would work.(need to get one frist).

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