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Humming noise coming out of the subwoofer - Logitech X-530 Computer Speakers

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Sounds like a bad cable, or a loose connection between the pc and the speakers, or from the main speaker to the subwoofer.

check the connections, or try reinserting the cables to ensure a tight fit. then check the cable from the pc to the speakers. possibly replace 1 cable and see if the problem stops.

Posted on Sep 23, 2009

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My 5.1home theater subwoofer giving more humming sound continues


Loud humming noise usually comes from a bad or missing ground connection, or a failed rectifier or filter capacitor in the power supply.

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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

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1 Answer

Woofer is humming


Usually a faulty cable or blown speaker will cause a humming. If it is a constant humming I would surmise a faulty cable. On the other hand, if the humming comes and goes I would guess a faulty speaker.

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Humming noise on your sound is not due to your speaker but it is come from the amplifier. I've encountered a lot of this problem that is caused by the electrolytic capacitor. If you are a technician first locate for a dry joints on the board and then resolder it using your soldering iron and a high quality soldering lead. Resolder not only the capacitor but also around the output I.C.
If nothing happen then it is coming from your output I.C. sometimes it was leaky/shorted which produces a humming noise but first do the the above mentioned instructions before isolating the defective output i.c.

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Iassume you mean you hear the buzz independently of the audio program - simply connecting the cable causes the buzz?

If tanything in the mix is powered from different AC sources you may have a different ground potential. Sometimes manipulating the orientation of one or more ac plugs will solve hum problems.

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If you're using it first time, check the sub cable u're using, low-quality rca cables can easily pretend to act as an antenna and pick up parasite and hum from electric lines or from other devices, also another factor is too-long cable. If u're using a cable longer than 5m, it should be really hi-quality and well screened. Or the hum is inevitable. I hope this helps.

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This can often be described as "ground loop hum." Which essentially means that the circuit providing power is not properly grounded at the electrical and/or signal source and it introduces noise.

If it is connected by a coaxial cable, move one end of it's terminals by twisting it while it is plugged into the connector. If it produces static or the hum goes away then it is the coaxial connection of the end you are twisting...it is either not tight enough or seating in deep enough, or it is a faulty cable. If none of those testing methods suffice, try plugging the subs' amp into a different outlet, or, into a surge protection device with noise canceling circuitry such as made by Tripplite. Other sources of the noise can also come from the amp being powered by the same house circuit as such things as your refrigerator, fans, fluorescent lighting, microwaves or any device with an electric motor.

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your circuit board is bad not repairable i have the same prob but not kenwood they said it would cost more then its worth.






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