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JDS Labs C5/C5D (pg96) portable amp/amp+DAC appreciation + discussion thread - Page 126

post #1876 of 2744
Quote:
Originally Posted by H20Fidelity View Post
 


I have C421 (OPA2227) with me, I'm really liking the sound it's giving me with my headphones. It seems to lean a touch cooler in tonality and clarity, sounds clearer than C5 in comparison, soundstage seems wider. However it doesn't seem to have quite the same (close) refinement/control as C5 though overall I like C421. Until....I plug my 10ohm Dunu DN-1000 hybrids into the amp. The high 10ohm (roughly) output impedance of C421 caused some rather obvious problems. My Dunu sounded hollow like someone sucked the mid range out or like the singer was coming through a tunnel. Go back to my fullsize headphones I really enjoy it.

So I guess this will depend on a few factors which I decide. I think what C421 does to my headphones is worth the purchase as it sounds great, however losing the ability to pair with a majority of my IEM collection kind of takes away the glory. I'll pair C421 up with ER4S this afternoon once it's charged again and consult this further.

So in a nut shell C421 great with my full-size headphones better than C5 to my ears minus some refinement but the high output impedance is really a bummer.
 

 

Perhaps try it on a full charge (if that matters). The C421 2227 was my "go-to" for IEM use for a number of months..

post #1877 of 2744
Quote:
Originally Posted by White Lotus View Post
 

 

Perhaps try it on a full charge (if that matters). The C421 2227 was my "go-to" for IEM use for a number of months..


The Dunu sounded really strange, they're only 10ohm, I haven't tried any others yet. I'll be sure to look into it with 32ohm IEM. 

I'm assuming C421 behave normally with H-200?
 

post #1878 of 2744
Quote:
Originally Posted by H20Fidelity View Post
 


The Dunu sounded really strange, they're only 10ohm, I haven't tried any others yet. I'll be sure to look into it with 32ohm IEM. 

I'm assuming C421 behave normally with H-200?
 

 

Yup - I have a few other sensitive IEMs that it behaved with too.

 

The only thing to note - it's not a digital volume attenuator, so the very first few notches of volume have a slight lean, but as soon as it gets to any coherent stage of volume, it's gone. 

post #1879 of 2744
Quote:
Originally Posted by H20Fidelity View Post


The Dunu sounded really strange, they're only 10ohm, I haven't tried any others yet. I'll be sure to look into it with 32ohm IEM. 

I'm assuming C421 behave normally with H-200?
 

 



What is the output impedance of C421? I'm guessing it's 2ohms or greater. A 10-ohm load will defintely alter FR response of the DUNU.

H-200 is 22 ohms perhaps it will work better with C421. I tried an 18ohm JH16 on AK120 (3 ohm) and it defintely affected the sound coming out of JH16.
post #1880 of 2744

JDSlabs claim the output impedance is 0.1ohms.. Up to you if you believe it or not!

 

:wink_face:

 

 

(Also not sure if that's the same for the 2227 edition as well)

post #1881 of 2744

I don't want to spoil the party but ClieOS says the output impedance is 10.7ohms. Now, if I remember rightly this may of been corrected in a revision of C421. I think we may need to contact ClieOS and get to the bottom of it.

You can see in his review of C421 he mentions the OI. (where I found it earlier)

http://www.head-fi.org/t/620775/the-sub-200-portable-amps-shootout-13-11-amps-compared

post #1882 of 2744

WE SUMMON THEE, @ClieOS 

 

(Who's opinion I would definitely trust)

post #1883 of 2744

The first version had about 10 Ohm output impendance. The second version come with a black,

brushed finish and he output impendance was reduced by 2 Ohms whch makes it ~8Ohms.

The 2 Ohm reduction was often confused with "brought down to 2 Ohms",which is not true, afaik.

Please wait for others to confirm this. I am using the later version and I can't complain.


Edited by zachgraz - 1/13/14 at 12:03am
post #1884 of 2744
It only seems to be the Dunu DN-1000 that behaves abnormal with C421, I've now tested other low impedance IEM like TF10, Rhapsodio RDB v1 Mini, they both sound fine. It's just the 10ohm Dunu that plays up.
Edited by H20Fidelity - 1/13/14 at 12:31am
post #1885 of 2744
Quote:
Originally Posted by zachgraz View Post
 

The first version had about 10 Ohm output impendance. The second version come with a black,

brushed finish and he output impendance was reduced by 2 Ohms whch makes it ~8Ohms.

The 2 Ohm reduction was often confused with "brought down to 2 Ohms",which is not true, afaik.

Please wait for others to confirm this. I am using the later version and I can't complain.

 

I am afraid zachgraz is right. The was an early confusion about the revised C421 being lower to 2ohm, but I believe it is indeed lowered by 2ohm (which makes it 8ohm). I never have the newer revised C421 for measurement as by the time, I had changed my focus to the newer C5. Was hoping C5 could have the AD8620 as well, as I am not really that big of a fan on OPA2227.

post #1886 of 2744
Quote:
Originally Posted by ClieOS View Post
 

 

I am afraid zachgraz is right. The was an early confusion about the revised C421 being lower to 2ohm, but I believe it is indeed lowered by 2ohm (which makes it 8ohm). I never have the newer revised C421 for measurement as by the time, I had changed my focus to the newer C5. Was hoping C5 could have the AD8620 as well, as I am not really that big of a fan on OPA2227.

 

Thanks mate!

post #1887 of 2744
Well then, if someone was trying to sell their C421 this would obviously lower the sale price, considerably......
post #1888 of 2744
Quote:
Originally Posted by H20Fidelity View Post

Well then, if someone was trying to sell their C421 this would obviously lower the sale price, considerably......

 

OR SELL IT TO SOMEONE WHO NEVER SAW WHAT JUST HAPPENED 

 

*

post #1889 of 2744

JDS blog:

 

The c421 Black Edition actually marks a small internal change. In response to In Ear Matters review in June, we swapped output ferrites from an 11 ohm part to a 2 ohm part (PCB has notchanged). It’s an extremely subtle change which can be made to any c421. Black endplates are also available as an upgrade kit for current c421 owners.

This entry was posted in Uncategorized and tagged anodizingc421CNC on September 21, 2012 by jseaber.

post #1890 of 2744

10ohm, 8 ohm, it doesn't really matter that much. C421-AD8620 will still get my top recommendation to pair with an ER4S as one of the best sounding combo out there.

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