DAC Output [OPA1611 or OPA132]

[felipeunix]

I'm doing a DAC output, with traditional buffer + differential, with 6 units of op amp for 2 channels.
I have only two units of the OPA132, and all I could already test what pleased me most, especially the treble.
But I see many comments for the OPA1611, but I could not test it, and your datasheet is really "charming", despite not having offset adjustment.
I'm really in doubt keep what is already great for me or risk the OPA1611.
Some help?

 

[abraxalito]

Why use an opamp at all?

 

[felipeunix]

Why use an opamp at all?

You mean use the same op amp both in the buffer as the differential ? Simply by standardization, would have better suggestions?

 

[abraxalito]

No what I meant was as you don't need gain, why not use discrete transistors as opposed to opamps? Certainly an opamp is convenient but sonically I find they're lacking compared to going discrete and I think its because opamps operate in classAB, which really is not a necessary compromise for audio.

 

[felipeunix]

Use a circuit in Class A ? Do you have any examples of circuit so I can analyze and think better ? I just need to make the line output stage .

 

[abraxalito]

Here's an example of what I mean, just use a darlington emitter follower biassed by a current source. It works as a buffer, but buffers can also be used to build filters as in this example.