In DX3, the RCA outputs will go directly to the headphone amp. No relay in the middle to switch off the RCA outputs. In your case, the long RCA cable will behave like an antenna for the headphone amp hence the noise.
Thank you for a reply! You have no idea how much this has been confounding me. Why would the noise not be there if I have it set to dac mode? (Or maybe it's there and I just can't hear it above my JBL 305s amp noise?)
Also, what's the point of all the great measurements if it produces very audible noise with RCAs plugged in? Wouldn't that render the low distortion/noise measurements kinda pointless. I was going to RMA it but if they're all like that there's no point. May as well just return it.
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