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Buzz in the audio - Optimus STA-3500 Receiver

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I checked my speakers there not blown out still making buzzing sound. Why?


the buzzing sound is an symptom or indication that there is a defect on the output audio system from your unit. A good audio system does not give out a buzzing sound.
Check for shorted audio wire coming from your audio unit going to the speakers

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RCA P52755 ST buzzing audio


Most likely the color wheel is the problem. This part can be replaced but is difficult and requires considerable dissasembly and then a difficult alignment process. Reccomend an RCA auth. service center for this repair.

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buzz in sound is often caused by ground-loops, try to isolate audio
cables with so called groundloop isolator transformers ( 1:1)
available at high end audio shops or car audio centres

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Buzz is caused by a bad ground or interference in your shielding check out your cabling or plugs that is where the problem lies.

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check where your pluging the red sounds like your pluging a video signal into an audio jack or your red cable ha an open ground

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Hum and Buzz Ground Loop


Best way is with balanced audio lines. Use either XLR or TRS cables IF your devices have those connections.

Also, do NOT use light dimmers as these are often a source of the higher frequencies that cause buzz.

Also power ALL the interconnected audio devices from a single source outlet rrather than from mulltiple building receptacles.

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1 Answer

Audio buzz


Check to see if reversing the plug takes away the buzz. Some times turning the plug over in the wall socket i.e. reversing polarity, will remove the buzz.

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