Question about Sharper Image SR277 Speaker

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Hum in speakers SR 277

An annoying hum overrides the music when speakers are turned on. Please advise

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This may indicate a ground loop problem. Try to have the power supply for the speakers and the music source plugged into the same outlet. Try another connecting cable if possible.

It's also possible the power supply for the speakers isn't working correctly. There are filter capacitors inside whose job is to smooth out the voltage that would make such hum. They may have bad connections to the circuit board inside (a common problem) or may have gone bad. You can check for and possibly repair these problems yourself if you've done any electronic soldering, or see if a TV shop in your area would give an estimate.

Posted on Nov 26, 2008

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How to isolate annoying background hum.

As long as the music or movie is playing, you can forget about it, at least until a quiet passage occurs, then there it is again: HUMMMMMMM! Be gone, bad hum, you think. But, like a bad odor at the back of the fridge, it takes some dogged persistence to track it down and eliminate it.

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Before you order one, you can try plugging your subwoofer into a different AC outlet in the room, ideally one that is not on the same circuit as your AV receiver and video equipment (TV, DVD player, sat or cable TV box, etc.) That may solve the problem. If it doesn't, see if the back panel of your sub has a "ground-lift screw". It will be labeled as such. Just remove it. That may remove the hum. If it doesn't and you have a standard cable-TV feed (not a dish), then order the ground-isolation transformer. (Axiom has special wide-band isolation transformers that will not interfere with any digital TV or HDTV signal.)
Axiom Audio Ground Isolator

If that still doesn't eliminate the hum, or if you use a satellite dish video feed, then you could try one of these from Radio Shack, which goes between the subwoofer and the coaxial cable from the receiver's subwoofer output.

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Hope it helped..

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If after doing this troubleshooting exercise, you will now need to test the speaker with another set to be sure the humming sound is not coming from there.

I guess that will Do.

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