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Zhaolu D2.5C vs D2.5A (both with discrete headamp upgrade). Other differences?

post #1 of 9
Thread Starter 
I was wondering, are there differences other than with the discrete DAC pcb for the D2.5A and D2.5C if both units are upgraded with the discrete headphone amp?

If one was to switch the discrete pcb where the AD1852 is with the discrete pcb with CS4398, would we get a completely functionally equivalent D2.5C?
post #2 of 9
I thought that was one of the features of the Zhaolu. You're free to buy any and all of the DAC boards and swap as your heart desires.
post #3 of 9
Quote:
Originally Posted by El Condor View Post
I was wondering, are there differences other than with the discrete DAC pcb for the D2.5A and D2.5C if both units are upgraded with the discrete headphone amp?

If one was to switch the discrete pcb where the AD1852 is with the discrete pcb with CS4398, would we get a completely functionally equivalent D2.5C?
I'm kind of confused as to what exactly you are saying here. When you say "discrete DAC pcb" I don't understand. You talking about the discrete amp module? Or the Zhaolu's DAC board? The discrete headphone amp module is a "discrete" design but it has nothing at all to do with the DAC or analog sections.

What do you have now and what do you want to do? Explain what you want to do here.
post #4 of 9
Thread Starter 
Quote:
Originally Posted by Sean H View Post
I'm kind of confused as to what exactly you are saying here. When you say "discrete DAC pcb" I don't understand.
Discrete as in (dis·crete) (dis-kr[emacr]t¢) [L. discretus; discernere to separate] made up of separated parts or characterized by lesions which do not become blended. An individual circuit component, complete in itself . You're most probably talking about discrete in the sense that it doesn't contain opamps though which would explain why you're confused .

Quote:
Originally Posted by Sean H View Post
DAC board? The discrete headphone amp module is a "discrete" design but it has nothing at all to do with the DAC or analog sections.

What do you have now and what do you want to do? Explain what you want to do here.
Heheh confusion doesn't suit you well. You're rolling up into a ball

The thing is I have a D2.5A right now with a headphone upgrade and I was wondering, if I was to switch the DAC board for the CS4398 board, would I get a completely functionally equivalent D2.5C or is the analog stage different on the D2.5C?
post #5 of 9
Discrete in terms of these type of products means (at its simplest) no op-amps in the signal path. The DAC boards use op-amps, as does the stock headphone amp. The upgraded headphone amp is discrete.

The DAC boards aren't as interchangeable (sp?) on the 2.5 as they were on the 2.0; they are no longer "socketed" daughterboards. So, ultimately, if you were to install a CS board in the 2.5A, then yes, I believe it would be a 2.5C. Someone can correct me if I'm wrong, but I'm pretty sure all other parts are equal.

I hope this answers what you were asking.....thx.
post #6 of 9
El Condo - Sorry for the confusion. Your use of the term discrete in the formulation of your question confused me at first (by the way I am aware of what a discrete circuit is) but I think now I understand your question. Skullguise pretty much answered it though. If you can somehow get a hold of a digital board with a CS4398 DAC chip for the 2.5, then yes, the analog stages are identical and you would thus have a bonafide 2.5C just as if you were to have bought one brand new.
post #7 of 9
maybe I misunderstan something about discrete but my upgrade headphone amp board has one op-amp. anyone can explain me what's this op-amp for?
post #8 of 9
Quote:
Originally Posted by chat7 View Post
maybe I misunderstan something about discrete but my upgrade headphone amp board has one op-amp. anyone can explain me what's this op-amp for?
That single opamp on the discrete amp board is likely for something like voltage conversion or the like. It's not in the signal path. FYI, the other day I was playing around with that opamp and swapped out a few different kinds and clearly heard a difference between them. If you have a spare OPA2604 around definitly swap out the stock opamp for it.
post #9 of 9
Thread Starter 
Quote:
Originally Posted by skullguise View Post
Discrete in terms of these type of products means (at its simplest) no op-amps in the signal path. The DAC boards use op-amps, as does the stock headphone amp. The upgraded headphone amp is discrete.
.

Hmmm, yeah, I suppose I should be careful if people here expect discrete to mean "no opamp in signal path" as opposed to "distinct".

Quote:
Originally Posted by skullguise View Post
The DAC boards aren't as interchangeable (sp?) on the 2.5 as they were on the 2.0; they are no longer "socketed" daughterboards.
Right, the whole DAC board has to be changed. Not as convenient as the socketed board, but it's easy enough to change .

Quote:
Originally Posted by skullguise View Post
So, ultimately, if you were to install a CS board in the 2.5A, then yes, I believe it would be a 2.5C. Someone can correct me if I'm wrong, but I'm pretty sure all other parts are equal.

I hope this answers what you were asking.....thx.
Great, this would solve my problem. The thing is I ordered a D2.5C and got a D2.5C box containing a D2.5A hehehe. I'll probably keep this guy (don't want to send it back and not be able to listen to music through the DAC ) and just buy the A1852 board. That way I can keep listening to this DAC without returning it and I'll get my CS4398 board anyways .

Oh, I was wondering, how many hours for burn-in on this DAC, D2.5A/D2.5C?
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