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Asus Essence One Headphone Amp/DAC (CeBIT 2011) - Page 143

post #2131 of 2132
5/22/13 at 12:19pm

I wasn't meaning that you need to use the LME49710HA's, or that those come stock, just that I used the same opamps at both the headphone out and RCA out.

 

You could try placing different op amps at the headphone out though to alter the sound to your taste.

Since the LME49600 opamps are only located at the headphone out I would guess that is the source of the shrillness.

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post #2132 of 2132
5/23/13 at 11:15am
Quote:
Originally Posted by Quaintative View Post

Well, both the headphone amp section of the E1 and the amp that I have (parasound Zamp) use torodial transformers, so that part of both designs is similar.

 

Beyond that, I don't have much to compare design-wise.

 

I'm using a stock Muses, so I presume this to be my setup:

● Balanced/ Un-balanced I/V:4 x MUSES 01

● Balanced/ Un-balanced LFP: 2 x MUSES 01

● Balanced/ Un-balanced Buffer: 3 x LM4562NA
● Headphone: 2 x LME49600

 

Which is from the Asus website... that's different from the LME49710HA's that mwindham08 has been referring to...

 

I'm not sure what I/V, LFP, and Buffer refer to. Still learning this stuff.

I will try and explain simply from memory, different opamps in the circuit perform different tasks such as:

 

I/V -> Current(I) to Voltage(V) converters: DAC chips are current output components so they require a I/V conveter, some chips have this converter built in and others use external I/V sections.

mosthighe endDAC chips dorequire externalI/V sections as this allows more flexibility for design and sound quality development.

 

LPF-> Low Pass Filter. to put it simply, it filters out everything except the signals you want, which is within the audio bandwidth.  They are typically used to remove the high frequency component/artifacts

that can be present on the DAC chips output. The audio signal being the lower frequency part of the signal, hence LPF.

 

Buffer-> Justbuffers to signal and/or provides level conversion to the signal for output or prior to being sent to another circuit component such as an Amp..etc.

Some opamp circuit positions will have a very pronounced affect on the overall sound quality/signature and others, not so much.

 

Hope that helps.


Edited by ROBSCIX - 5/23/13 at 11:24am
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