Sony UDA-1 - Manual (Page 79)

USB DAC AMPLIFIER
UDA-1
There is severe humming or noise.
Check that the speakers are connected to the USB DAC AMPLIFIER correctly.
Move your TV away from the USB DAC AMPLIFIER and other audio equipment.
The plugs and ports are dirty. Wipe them with a cloth slightly moistened with alcohol.
Related Topic
Connecting speakers
Notes on use
4-469-134-11(2)
Copyright 2013 Sony Corporation
Help Guide
Troubleshooting
79