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2.0 Ch usb powered Speaker system buzzing

When i plug in my speakers i hear a constan buzz like an alarm kinda but when i unplug the power cord it goes away

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Hi, check all the connections,cables and replace as needed. sounds like a ground loop.also your power outlet may not be grounded or the power adapter may have issue, this could case the condition you describe.try other power outlet. you can get filters ,conditioners at like radio shack or places like that.. hope this is useful. good luck!

Posted on Feb 15, 2009

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VK 112 will power up but no sound, coming through

The valveking series of Peavey amps are valve amplifiers.

By "will power up" I take it you mean the power lamp is lit thus eliminating power plug, ac cord and on / off switch and main fuse from our investigations. Before we continue you must understand that valves are a voltage operated device and voltages around these components are dangerously high (200 to 400 volts is quite normal). Electricty is dangerous. You cannot see it, smell it or hear it. If you have any doubts about your ability to service this appliance do not proceed but seek help from your local srvice provider.
If you feel confident that your level of skill is good, then let us proceed. Unplug the appliance from the ac power and remove the chassis from the cabinet, you will now have access to the component side of the chassis. Reconnect the speaker. You will

require a multimeter (digital or analogue) set to the highest dc range. Connect the negative terminal of the meter to the chassis.

You are now ready to plug the amplifier into the ac power and switch on. Do all the valves light up in the output stage, can you hear a faint hum or buzz from the speaker. If all valves lit but no buzz disconnect ac power and measure dc resistance of speaker. If about 6 to 8 Ohms its ok. If infinite replace speaker. If ok reconnect ac power and continue with the next step. Measure the dc voltage on the anodes (plate) of each output valve and the voltage on the screen grids of the output valves. These should be in the region of serveral hundred volts. One word of advise when taking meaurements around high voltage circuits, KEEP ONE HAND IN YOUR POCKET. you will then be more likely to survive this exercise. If all appears good up to this point, locate the master volume control, turn it up to maximum. With a screw driver

and using only one hand touch the terminals of the control. Do you now hear a loud buzz from the speaker if yes the the output stage is ok, if not the the fault lies within the output stage.

When you have carried out all of the above, post a detailed report of your findings and we will continue with our diagnosis.

Good luck and be safe. Regards from Vintie

Sep 18, 2013 | Peavey Audio Players & Recorders

1 Answer

I get a loud intermitant buzz from one of my JBL eon 15-G2 speaker, no music signal just buzz. What is the problem do you think...? EQ circuit problem, speaker cones seem to be intact.

If you turn the unit on with no input and get a loud buzz, and when you put signal to it and you cannot hear the music but the buzz (Probably more like a hum). Then most likely the amp is blown.

Dec 13, 2010 | JBL EON 15-G2 Powered DJ Speaker With EQ...

1 Answer

Speakers buzz with no sound

Is this only with CD, only with THAT CD, or with nothing in particular selected or playing?

Check all connections for tightness as bad cable shield connections will let emitted noise into the system. Ditto for signal or speaker cables routed near power cables, TV's, other electrical sources.

Sometimews reversing the AC power cord polarity can resolve buzz/hum.

Feb 20, 2010 | Philips HTS3440/37 System

1 Answer

Getting buzzing sound from speaker but can here sound from them.

You could have an earth loop which causes a hum/buzzing sound.
Is your computer and powered speakers plugged into different mains?
Connecting amplifiers and speakers to different power sockets will create earth loop problems
This can be fixed by using a single power board connected to a single mains power socket, then connecting all the computer components and powered speakers into this one power board.

Oct 31, 2009 | Harman Kardon Harmon Kardon SoundStick II...

1 Answer

Subwoofer Emits a Buzzing Tone

The 2200 uF capacitor in the power supply has gone bad and the humming is a 60 Hz from the rectification of AC to 18 vDC.  Either get a new power supply or take apart the power supply and replace the bad cap.

Mar 16, 2009 | Altec Lansing AVS 500 Computer Speakers

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Loud humming buzzing sound coming from subwoofer

make sure you have the speaker connection right if you do then it is a ground problem try plugging it in a different outlet

Dec 16, 2008 | KLH HTA-4906 System

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Buzzing noise

Of course it will stop buzzing when you mute the speakers. From the limited description, it could be anything from a power supply to loose wires in the system between the speaker leads and the motherboard. Best bet is to take it in to a technician and get a pro's answer. If he wants to charge more than what it's worth to you, get a new one.

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