Question about RCA RT2500 System

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Only humming noise from speakers

Its a rca rt 2250 system

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  • Derek Williamson May 11, 2010

    Does it hum even when its on the tuner/radio input?

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  • 7 Answers

The humming is probably caused by failing filter capacitors, these are usually quite large, also look for cold solder joints around parts the heat and cool continuously. Please post an update to further troubleshooting, if this doesn't solve the trouble.

Posted on Mar 18, 2010

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If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

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