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Opamps applied in a DAC can sometimes be a disaster, if it is fed the raw unfiltered signal from the DAC chip. All the HF (noise) will stress the opamp making it sound a little coarse. According to an insider I know, this error has been done with quite a many DACs… But within the right environment, like Peter says, opamps are the best and certainly the most convenient solution.
Thats right! I just building a new DAC with the TDA1541 and use first a Passive filter and then an opamp with some gain (32dB). Opamps don't like HF signals comming from the clocking and other noise, blocking the noise to the opamps is an essential part of the design.
Suggested opamps: LME49710, AD797, LT1115, OPA637
In the the digital part I use an upsampler AD1896 controlled by a tentlabs clocking so the TDA is running at 192KHz, in my opinion the best solution today.
