Question about Black & Decker 1000w Power Inverter

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Have a 1000 watt black n decker converter and it is humming and making a loud sharp noise. The pump that it's attached to does work. We are trying to find out why it's making these sounds.

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When connecting a MOTOR to a DC to AC inverter the clipping sound comes from the fact that a inverter produces a switching voltage (Square wave) not a sine wave, than the motor's winding acts as a transponder and emits a clipping sound.... always check the specifications to see if you can plug any kind of motorised device to the inverter... electric motors have a different load ratings than other electric/electronic devices due to the mechanical impact (if it turns freely or has restriction) it affects the power rating...

Posted on Apr 09, 2011

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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.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

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Since it's less than a year old, it's fully under warranty and Sharp will fix it free.

You can contact Sharp at 1-800-BE-SHARP (1-800-237-4277) or visit them online to get it fixed.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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