There is severe humming or noise, Help guide – Sony HAP-S1 User Manual

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HDD AUDIO PLAYER

HAP-S1

There is severe humming or noise.

Check whether the cords or cables are broken or have any other defects.
Check that the speakers are connected to the HDD AUDIO PLAYER correctly.
Check that the connecting cords are not near a transformer, motor, TV set or fluorescent light.
Move your TV away from the HDD AUDIO PLAYER and other audio equipment.
The plugs and jacks are dirty. Wipe them with a cloth slightly moistened with alcohol.