Question about Onkyo HT-SR800 System

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Hum Having humming sound from the subwoofer. What could be the source? Could interent cable nearby be causing the problem?

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Re: hum

Posted on Nov 18, 2007

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Bose av18

Hum is tough. It is often caused by quite a variety of things. First, address the basics:
1. Make sure that none of your signal cables run near to power cabels.
2. If possible, feed all power from the same receptacle.
3. If your plugs are not polarized, try reversing one at a time.

If none of those basic checks uncovers your demon, verify the path of the noise by disconnecting the signal from the preamp at the input to the sub. If is still hums, then look closely at the power feed to the sub, More likely, the hum will stop (along with the music.) In this case, try breaking the shield ground at the sub input (e.g. with a ground isolation adapter.)

You should also confirm that the hum is limited to the sub. Subs tend to exaggerate hum because playing signals in the 60Hz is their forte. So with the sub turned off and bypassed, listen for the hum in your main speakers. If it is there, too, then start checking your sources. Remember, even a source device other than the one selected for play could be the source ... completely disconnect each source at the preamp to track it down.

Aug 03, 2014 | Bose Home Theater Systems

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.

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

1 Answer

Subwoofer is hummig what is this noise

Hum is a constant low-frequency buzz, usually at about 60 Hz or 120 Hz, which results from voltage differences between true "ground" (what you'd get shoving a copper pipe into the ground) and the electrical "ground" of your receiver's chassis When this voltage differential exists, it's called a "ground loop," and the hum it produces is darned annoying. You'll hear the hum mainly from the subwoofer because it's a low-frequency noise, you will need a ground loop insulator they are about $20 at any electronic store

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

1 Answer

How do I eliminate the humming on my Vizio VHT-510 system

see this instruction and fix it. God bless you

    • 1
      Disconnect the coaxial cable at the back of the satellite receiver or cable box by unscrewing the coupler on the cable end.

    • 2
      Attach the cable to the RF IN jack on a surge protector and tighten the coupler clockwise.

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    • 3
      Connect a second coaxial cable from the RF OUT jack on the surge protector to the input on the cable box or satellite receiver. If this stops the hum, congratulations: You're done.

    • 4
      Unplug the subwoofer's electrical cord from the power strip or wall outlet if it is connected to the same circuit as the AV receiver. The amp in the AV receiver and the amp in the subwoofer are in conflict over the grounding of the electrical circuit.

    • 5
      Plug the subwoofer into its own surge protector and connect the surge protector to a different wall outlet than the AV receiver uses.

    • 6
      Disconnect the subwoofer cable from the back of the sub and the AV receiver if all other measures fail to stop the humming. Reverse the plug connections so the plug that had been connected to the receiver is now connected to the subwoofer. Turning the cable around may solve a problem known as ground-loop hum by reversing the shielding wire inside the cable.

Read more:

Jul 20, 2013 | Vizio Vht210 2.1 Home Theater Soundbar...

1 Answer

Humming sound from subwoofer

hi Eileen Beamish,

One reason you found it in ......... , is that , These unit have a problem.

Humming is the main problem.

Resolved first the humming , then it will answer your questions

when you have succeeded repairing your subwoofer system.

It is irrelivant for now.

Here is a guide , how to repair or diagnose circuits which can cause

like the symptoms your having.

Computer Speakers
you can post an image or a picture just to help you identify which

possible board or components to check, only if you need to Diy.

Oct 14, 2012 | Sony Str-de685 Receiver 5.1 Dolby W/...

1 Answer

Why? no sound from the speskers at all.

There are a few things that could cause no sound and although some are obvious I'll got through them all..

1) Sound is on Minimum

2) Sound is Muted

3) No Power to Subwoofer

4) Speakers connected Incorrectly or Faulty

5) No AUDIO IN connections to TV-IN or AUX-IN

6) Incorrect Input Source is Selected (See Below)

Connecting audio from TV

When connecting the audio output from your TV to this Home Theater Audio System, you will have the sound of the

TV output on all the speakers. It will enable you to enjoy the multi-channel surround sound capabilities.

Use an audio cable (red/white - not supplied) to connect the TV IN jacks on this DVD system to the AUDIO OUT

jacks on the TV. To listen to the sound, press TV on the remote control as the sound source that you want to play.

Connecting audio from an audio/video device

This DVD system provides analog and digital audio connection. You can connect the audio output from an

audio/video device (e.g. VCR, Cable/Satellite Box) to this Home Theater Audio System in order to enjoy the

multi-channel surround sound capabilities.

Use an audio cable (red/white - not supplied) to connect the AUX IN jacks on this DVD system to the AUDIO OUT

jacks on the connected device. To listen to the sound, press AUX/DI to select "AUX" as the sound source that

you want to play.


Use a coaxial cable (not supplied) to connect the DIGITAL IN jack on this DVD system to the DIGITAL OUT jack on

the connected device. To listen to the sound, press AUX/DI to select "DI" as the sound source that you want to play.

Please leave feedback



Apr 27, 2011 | Philips HTS3450 System

1 Answer

I recently moved and am having trouble getting my phillips subwoofer system model : MMS171W hooked up properly There is a loud background hum when I attach it like I think it should be attached. Any ideas...

This is most likely a "ground loop" and is caused by using two different electrical outlets for the two parts of the system -- main receiver and subwoofer amp.

Try using the same electrical circuit (wall outlet) for all of the equipment in the home theater, using a power strip or strips as needed.

Nov 07, 2010 | Philips Home Theater Systems

1 Answer

I have an Onkyo SKW-50 subwoofer and when I turn on the power to the subwoofer, it is making a low-level humming sound. When I turn the frequency dial up or down, the sound of the hum gets louder or softer...

may be u have a power problem check if ur ground is well connected to ur amplifer and also check the input cables if there ground wires r intact and make good contact

Dec 20, 2009 | Home Theater Systems

1 Answer

Humming sound coming from subwoofer what is that?

Sounds like a ground loop to me. Try throwing a ground lift (adapter that goes from 3 prongs to 2) on your sub's IEC cable. Hope this helps!

Dec 19, 2009 | KEF Audio KIT100 System

1 Answer

Nakamichi Sound space 8.5 Home theatre system

check and see if you can get these parts.good luck.greeting from Belize my email is

Apr 04, 2007 | Nakamichi SoundSpace 8.5 System

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