jamato8
Headphoneus Supremus
I am not sure I understand the question. The D1 is a dac and an amp that can run from the input to output as a dac/amp. The NE5532 is the output buffer from the amp section. The amp section be run by itself bypassing the dac using a different source or you can use the dac by its self bypassing the internal amplier or the dac with the amp and an all in one unit.