[ostewart]

It's the op-amp, there are 2 on the C421 order page, OPA2777 OR AD8620

 

[mebubblemaker]

Randomkid, I'd be interested in knowing if there is a specific reason you prefer the 8620 op-amp? Thanks and glad your enjoying your amps.

 

[ostewart]

Well i like a detailed sound, the OPA is more smooth with a lush mid-range.
 
I will hopefully be comparing the 2 next year.

 

[mebubblemaker]

Thanks for the reply randomkid. I have the 2777 and think its great. Would be interested in your thoughts after you have compared the two. Cheers!

 

[guyuemuziye]

Quote:

 
yea thats definitely adds up ... so i'll be waiting for your delivery as well ... what do you mean by LOD sorry am not familiar with these terms if its a connector why would I need it .. my source will the iPhone 5 ... if its not would you suggest what kind of LOD and where to get it and how it works sorry for asking too much .. I  really appreciate your help bro  

Well, I may go down the same road as you. I already have a E11 and JDS CmoyBB. I just tried my very best to control my self: not to click the button on JDS website again. But I think the any reason kept me from clicking is that I'm not quite sure to get a O2 or C421...

 

[ostewart]

C421 for portability, O2 for home use, that's what I have, the O2 is not portable

 

[jono454]

Just ordered a C421 2227 to go with my Hifiman HM601. Can't wait to listen to the results. 

 

[Caesar7]

Quote:

Just ordered a C421 2227 to go with my Hifiman HM601. Can't wait to listen to the results. 

 
Enjoy and show us your feedback  

 

[jono454]

wrong post. 

 

[jono454]

Posted this on another thread after some impressions
 
"Reporting back after using them for roughly 20 minutes.
 
I think i'm in love with this combination.
 
HM601slim + C421 (2227) + reshelled TF10.
 
My music now sounds very "alive". The bass boost also adds a bit of punch but not too much. 
 
Since the HM601 is on the warmer side and apparently the 2227 is also on the warmer side it helps tame a bit of the harshness in some of the songs which now sound absolutely beautiful. 
 
Micro detail is also improved vastly...can't really explain it but my music sounds a lot more edgy "
 
Warm + warm = helped tame a bit of harshness in some songs. 

 

[Xinze]

Strange, my E11 provided barely any difference for all my cans besides 250 ohm Beyers.

 

[penmarker]

Quote:

Strange, my E11 provided barely any difference for all my cans besides 250 ohm Beyers.

Amps are supposed to be wires with gain. The E11 is a relatively neutral amp, so it won't provide differences to your headphones, if they don't need an amp in the first place.

 

[Roan3489]

I have a c421 for sale if anyone is interested. Just search for it in the for sale section. Cheers.