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by dextersgenius 2750 days ago
Have you tried using a DAC with a USB noise isolator? I don't get any hiss with my setup:

Neutron Player on Android > USB OTG cable > HiFimeDIY USB noise isolator > HiFimeDIY USB DAC > Beyerdynamic DT880

Although I don't use all that any longer, for convenience sake I just use a wireless Audiotechnica ATH-DSR9BT which supports aptX-HD and produces "good enough" quality with no hissing/noise.