[gelocks]

Wait ... what?!?
Your Iphone should adequately drive those 2 headphones loud-enough without problems!! Where are you using the headphones? Anyway, yep, that's the job of the amp, provide you with a bit more volume and body. I'm sure you will be satisfied with the c421s.

 

[politechnica]

Quote:

Wait ... what?!?
Your Iphone should adequately drive those 2 headphones loud-enough without problems!! Where are you using the headphones? Anyway, yep, that's the job of the amp, provide you with a bit more volume and body. I'm sure you will be satisfied with the c421s.

 
Thanks for the quick reply...
 
I use the DT1350 on the balcony when i'm out for a smoke or read... or when i'm in public transportation.
Environment doesn't really matter since the DT1350 block every noise from outside (so good).
 
I think i'll give the c421 a try, since it's not that expensive...

 

[gelocks]

Even with my Archos 7 (a media player from a company in France that actually LOWER the volume of the players before selling due to EU regulations) I just put the volume to 75-90%, connect it to the c421 and if I'm not careful I could hurt my ears! lol
 
So yep, get it and let us know how you like it!

 
Enjoy!

 

[politechnica]

Quote:

Even with my Archos 7 (a media player from a company in France that actually LOWER the volume of the players before selling due to EU regulations) I just put the volume to 75-90%, connect it to the c421 and if I'm not careful I could hurt my ears! lol
 
So yep, get it and let us know how you like it!

 
Enjoy!

 
Ha, will do so. It will take 2-3 weeks for the order and shipping and... But i'll give a feedback asap.
 
P.S. should i get a LOD cable too? I could order the Fiio L3 from JDS Labs too, since i'll be already placing the order?

 

[Mauricio]

The average volume setting with the DT770Pro 250Ohm is about 2/3rds on low gain.

 

[Yuceka]

Ha, will do so. It will take 2-3 weeks for the order and shipping and... But i'll give a feedback asap.

P.S. should i get a LOD cable too? I could order the Fiio L3 from JDS Labs too, since i'll be already placing the order?

Yes you should get a LOD cable otherwise you'll be double amping which is not ideal

 

[gelocks]

Quote:

Yes you should get a LOD cable otherwise you'll be double amping which is not ideal

 
This.

 

[ExpatinJapan]

Quote:

 
Ha, will do so. It will take 2-3 weeks for the order and shipping and... But i'll give a feedback asap.
 
P.S. should i get a LOD cable too? I could order the Fiio L3 from JDS Labs too, since i'll be already placing the order?

You might want to think about a Fiio L9 LOD, low profile (doesnt stick out so much).

 

[Mauricio]

Quote:

The average volume setting with the DT770Pro 250Ohm is about 2/3rds on low gain.

 
I hooked up the C421 earlier this morning to a stand-alone CD player.  Due to the higher line voltage, I was able to hear my 250Ohm cans on 1/3rd volume on low gain.

 

[LoveKnight]

Oh, really? Then C421s probably have more than enough power to drive my Sennheiser HD 598 without problems at all at low gain. I am saving money to buy C421 - OPA2227. However, I am considering which 3.5mm interconnect cable I should buy with C421 on JDSLabs website?
 
This one Fiio L2 http://www.jdslabs.com/item.php?fetchitem=L2 or this one iSimple http://www.jdslabs.com/item.php?fetchitem=ISVE913 . Which one is better? My DAC now is Fiio E10. Thanks for answer this question.

 

[Mauricio]

I got my Fiio line out cable at Amazon.

 

[zeitfliesst]

Has anyone tried using the C421 with a sensitive IEM? I want to use this with my ES5, but I did see someone mentioning that this amp was too loud for his UE4, so I'm kind of worried.

 

[Yuceka]

Quote:

Has anyone tried using the C421 with a sensitive IEM? I want to use this with my ES5, but I did see someone mentioning that this amp was too loud for his UE4, so I'm kind of worried.

I have been using them with my 1964 Ears Quads and I don't think they are too loud with the C421. But it can get to loudness leves that would be very harmful for your hearing but that's dependent on the user and not the design of C421. Unless you like to listen to music in whispering levels, no it won't be too loud but I don't know how sensitivity differs between Westone ES5 and my own Quads. 

 

[zeitfliesst]

Thanks for sharing that. They have nearly the same sensitivity (118 vs.120), but yours has a higher impedance @ 46 ohm vs. the es5 @ 20 ohm. I'm not sure how that plays out, but I guess I will be fine? I even contacted the manufacturer and they assured me that they brought the low gain a notch down several months ago, and that they use it with sensitive IEM's so yeah... I'm exchanging the digizoid ZO2 for the C421 (the ZO2 had a terrible hiss and the volume was way too loud)
 
Oh, and just curious. How much do you turn the knob around to get to your comfortable listening level with the 1964 quads?
 
Quote:

I have been using them with my 1964 Ears Quads and I don't think they are too loud with the C421. But it can get to loudness leves that would be very harmful for your hearing but that's dependent on the user and not the design of C421. Unless you like to listen to music in whispering levels, no it won't be too loud but I don't know how sensitivity differs between Westone ES5 and my own Quads. 

 

[Yuceka]

Quote:

Thanks for sharing that. They have nearly the same sensitivity (118 vs.120), but yours has a higher impedance @ 46 ohm vs. the es5 @ 20 ohm. I'm not sure how that plays out, but I guess I will be fine? I even contacted the manufacturer and they assured me that they brought the low gain a notch down several months ago, and that they use it with sensitive IEM's so yeah... I'm exchanging the digizoid ZO2 for the C421 (the ZO2 had a terrible hiss and the volume was way too loud)
 
Oh, and just curious. How much do you turn the knob around to get to your comfortable listening level with the 1964 quads?
 

Well it's not stepped nor like Arrow or Leckerton UHA-4 (I don't remember what their implementation is called now) so it's hard for me to describe in writing but maybe just two notches or 3/10 or 4/10 if that helps at all? But I doubt you'll have any issues with it. 
 
One thing, I have used Zo2 extensively and never heard any hiss with my Quads but I can say that the Zo2 was much louder than the C421.