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Ground hum/noise - goes away when i connect the body with the "head". Touching ONLY the "head" produces a horrible noise. I´m guessing faulty grounding. Bought it 2nd hand - they said it was 100% working. Can I open it up somehow and check the wiring? Andy

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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.

Dec 28, 2013 | Vizio 2.1 ch. Sound Bar with Wireless...

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I have a brand new Sony Bravia flat screen HDTV hooked up to Charter Cable. There is a constant background humming sound which is really annoying. If I turn down the tv volume (to where I can't hear the...


Hey, first thing that comes to mind is that your cables are faulty.

OR

your receaver (or what your tv is connected to) Is causeing the buzz.

Possible reasons: the device has a bad connection or bad signal. Or your powersystem is unstable.

Heres a text about GroundLoop.
http://www.epanorama.net/documents/groundloop/

If you need more assistance let me know!

Mar 11, 2008 | Televison & Video

1 Answer

My JES636WK01 microwave heats up but it makes a loud humming noise. I suspected the Magnetron and disconnected it. The microwave was then operated and the n oiuse was the same. Do you have any ideas


Disconnect the HV transformer leads from the magnetron and the capacitor. Make sure none of the wires are touching the chasis or other parts. If the loud humming sound is still present, it is the High Voltage transformer making the noise. If the noise goes away, it is the High Voltage Capacitor going bad.

*MAKE SURE TO UNPLUG UNIT BEFORE TOUCHING ANY OF THE HIGH VOLTAGE LEADS! ALSO, DISCHARGE THE CAPACITOR BY SHORTING THE TWO SIDES AGAINST EACH OTHER!

Apr 15, 2011 | General Electric Microwave Oven

1 Answer

I have humming noise from earphones connection Minidisc MZ -N1


Are you using an AC adapter, or running it on batteries? If 'wall-wort' AC adapter, that's the issue. If you're running it on batteries, sounds like a bad ground, try different earphone/headphones and see if the hum goes away. With the 2nd pair of headphones/earphones, does the hum go away, or if you wiggle the headphone jack back and forth a little bit?

May 02, 2010 | Sony MDS-JE320 Mini Disc Player

1 Answer

My home theater speakers make a constant hum whenever my receiver is on. The loudness of the hum changes with the volume control, and goes away entirely when the system is muted. All components are plugged...


jd40,
Sounds like a grounding issue. The first two places to look into is the powered subwoofer and antenna. During your last test, did you leave the FM antenna and subwoofer connected? Many times the hum is directly related to the antenna and/or the subwoofer and to how they are grounded; creating a ground loop through the receivers ground on the outlet. If the antenna is grounded to the dwellings wiring, hum is inevitable and sometime you can get a ground loop hum from how or how & where the subwoofer is grounded. Try taking them completely out of the loop.

Also try taking it further back to the basics, start with the receiver plugged into a known good grounded outlet with no surge or line conditioner in the loop and nothing connected to the receiver, nothing. Use one speaker and different wire to test each speaker output while in tuner and any other mode but phono. With no signal, you will either get nothing (no hum or static) or just static in the tuner mode. No hum is a good sign. Some systems will mute the speakers if no signal is connected to eliminate the static from being produced through the speakers but a ground loop hum will most likely still be produced even in mute. If you get a hum when nothing is connected to the receiver, try looking into getting a better grounded outlet, even maybe to a different dwelling.

-Chris

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1 Answer

HUm problem. Worse when touching outside of mic.


Hello

Check the grounding wire on the mic itself, this is where the problem lies, cause when you touch it, the grounding follows an alternative path through your body, that is why the humming increases when you touch it.

Hope this can steer you in the right direction.

Kind regards
Andrea

Dec 12, 2009 | Computers & Internet

1 Answer

Subwoofer hums


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.

Nov 14, 2009 | Cambridge Soundworks P200 Subwoofer

2 Answers

Hum in the audio - 32'' Proscan 1080i


does the hum occur when playing a dvd or only when watching tv ? if the hum occurs only when watching tv, i would like you to disconnect the cable line from either the wall or the back of the cable box and see if this hum disappears. if the hum disappears call your cable company. you have what is called a " 60 cycle ground loop ". hope this helps.

Jan 20, 2009 | Televison & Video

2 Answers

Static noise coming out of speakers


What sort of computer do you have? Is it a laptop or desktop? Many laptops have this problem and it is quite widespread in laptops. The crackling or humming noise could be a result of interference from the mains power signal.

If it's a laptop, try running it on battery alone (take out the mains power cord). My laptop has this kind of noise in speakers when running on mains electrical supply, but it goes away like magic when I run it on battery.

A more long-term solution is to buy a 'Ground Loop Isolator' and insert it between your computer and the speakers/earphones. They are quite cheap and you could get it for under £10. It removes all static noise and you'll hear crystal clear sound.

Jan 01, 2009 | Dell A215 Computer Speakers

1 Answer

My car amp works produces distorded noise . As I plug in the rca cables i noticed that if just the tip of the connector touches i get a good sound but if i insert the whole connector it becomes distorded...


You have a grounding issue.

The RCA inputs of the amp are many times NOT tied to chassis ( the chassis of the car ) ground.

Same goes for the RCA outputs of your head unit.

The speaker outputs of your amp SHOULD NOT EVER be tied to chassis ground.

  • make sure that no speaker wire from the amplifier is touching or attached to ground.
  • Make sure that your amplifier ground (GND )( of the 3 power inputs.....GND, +12V, Rem) is securely mounted to a bare metal spot on the frame. Best practice is to have the amp GND, and the head unit GND at the exact same physical point.
  • Make sure that your RCA cable shield ( not the center tip, but the part around it ) is not touching the chassis.
  • Make sure that you have not nicked the wire while installing it and are accidentally getting a connection to the frame of the car.
  • Make sure that the head unit is grounded properly.
  • IF for some reason you have an equalizer between the head unit and the amplifier, make sure it has its own switching power supply INSIDE the EQ.
Bad grounds are a pain to troubleshoot......best of luck....Rob

Mar 17, 2008 | Audio Players & Recorders

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