If you use the SPDIF/coax output of your DAC, and plug into the SPDIF/coax input of

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a second DAC, which DAC is being used? DAC1, DAC2, or some weird frankenstein DAC made of DAC1 + DAC2?

I ask because I use my Yamaha a/v receiver as a headphone amplifier, and I connect the SPDIF/Coax out of my DAC to the SPDIF/Coax in of the receiver. But the receiver has its own DACs and I'm wondering if I'm listening to the receiver's DAC or the original DAC?
 
A DAC does not have an SPDIF output. It may have an SPDIF input. The output is analogue and therefore not SPDIF. I suppose some DACs may have an SPDIF loopthrough, but I suspect this would be rare as it seems pointless.

The DAC you are using is whichever DAC has its analogue output connected to you amplifier and speakers.

I suspect you are not doing what you think you are doing?
 
This the DAC. PD05 XMOS+PCM5102+¹ú°ë¶¥¼¶¶ú·ÅÇý¶¯ ±ãЯUSB DAC+¶ú·Å-Ðè¶¨ÖÆ-ÌÔ±¦Íø

It sounds horrible using its built in amplifier (well, not horrible, but really insufferably bright) so I need to amp it. My best amp is my yamaha 5.1 a/v receiver. I know that if I connect the headphone out of my DAC (call this DAC1) to the left/right RCA in of my receiver, then I'm hearing the DAC of DAC1. However, what if I use the SPDIF/coax out of DAC1 (the red plug you see in the pic) to connect to the SPDIF/coax input of the receiver? Am I hearing DAC1's DAC, or the Yamaha receiver's DAC?

Edit: The coax and headphone output of my DAC are clearly different, and I think the coax output of DAC1 is not sending analogue information, because if I use the coax out of DAC1 then my receiver knows what bits/hertz are being sent (my receiver shows the bitz/khtz/channels of each input e.g. it says 2 channels 24bit 96khz or 2 channels 16 bit 44khz or whatever, depending on what I set the DAC to) but if I use the headphone out, that information is not sent to the receiver and so the receiver doesn't say what bit/khz is being used.
 
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Never mind. I found out with certainty that if I use the coax/SPDIF out of this DAC, then the DAC is definitely being bypassed and that I'm really listening to the DAC of the Yamaha receiver. Leaving this thread in case anyone else has this question.
 
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