Glenn2
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A lot of XLR->RCA adaptors are designed to be plugged into the inputs of amps, not the outputs of sources. They have the -ve phase shorted to ground (pin 3).
Plugging one of these into the XLR output of the DacMagic is putting an excessive load on the NE5532 op-amp that is driving the -ve phase, which is also providing half of the signal for the OP275 that is combining the two phases for the RCA.
That is why the +ve phase of the XLR (pin 2) sounds fine but the RCA doesn't.
What you are describing is exactly what I'd expect to happen.
I made my own adaptors and left pin 3 floating. Maybe you can perform some surgery on yours (or snap off pin 3). At least test continuity between pins 1 & 3 to confirm a short.
You want pin 1 to ground of RCA, pin 2 to signal of RCA, pin 3 unconnected.
Hope that helps!
Glenn
Edit: you won't have damaged anything by shorting pin 3, by the way.
Plugging one of these into the XLR output of the DacMagic is putting an excessive load on the NE5532 op-amp that is driving the -ve phase, which is also providing half of the signal for the OP275 that is combining the two phases for the RCA.
That is why the +ve phase of the XLR (pin 2) sounds fine but the RCA doesn't.
What you are describing is exactly what I'd expect to happen.
I made my own adaptors and left pin 3 floating. Maybe you can perform some surgery on yours (or snap off pin 3). At least test continuity between pins 1 & 3 to confirm a short.
You want pin 1 to ground of RCA, pin 2 to signal of RCA, pin 3 unconnected.
Hope that helps!
Glenn
Edit: you won't have damaged anything by shorting pin 3, by the way.