Quote Originally Posted by Yomanze View Post
I don't quite know what you mean by unamplified? With modern delta/sigma DACs the output stages and filters are already built into the DAC chip, and these have been in the market for decades now. I think designers feel the need to introduce a needless extra stage just to say that they actually designed something. Best thing you can do with the majority of delta/sigma DACs is to use a resistor and a capacitor, nothing more... DIYers have been doing this for years!
It's quite clear you haven't got a clue what you are on about. I suggest that you read up on the implementation documents from the likes of Texas Instruments and Wolfson with regards to the various Delta Sigma chips that they manufacture. Each chip requires a different kind of output configuration. You certainly wouldn't get away with putting a capacitor and resistor at the output of a WM8741 or PCM1792 and expect to get a usable signal that can be sent directly to the input of an amplifier. On top of that, the filters built into some DAC chips are digital filters. That's completely different from the external analogue filter requirement.