CD Player · Rotel · RX-503
Diagnosis: Hum or Buzz
A low-frequency hum or buzz is audible through one or both speakers.
Safe first checks
- Turn the volume down before changing cables.
- Disconnect all input cables; if the hum remains, it is likely inside the unit or related to speakers.
- Reconnect sources one at a time to identify a source, cable, or turntable ground issue.
- Use the turntable ground terminal only for the turntable ground wire; do not defeat the power plug safety ground.
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Next step
Record whether hum changes with the volume control and whether it is present with all sources unplugged.