Question about JVC RX-778V

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Sub hello i just got my jvc hooked up and when i plug in my sub all it does is hum. even if it isnt hooked up you can just put you finger on the end of the input wire and it will start humming. please help.

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Most amplified sub woofers need to be grounded to the output source.If you plug the sub woofer in to the receiver you would use a ground wire from the receiver to the sub woofer there should be a ground terminal on the sub woofer and receiver.

Posted on Jul 28, 2008

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My KLH powered sub maks e a humming sound when i plug it in but it only hums when the speaker is hooked up i tried others but did the same eventually speaker started smoking would wrong fuse do that


Wrap a wire around the outside Metal of your rca jack in back of your radio and ground the other end of that wire to the back of your radio and the noise goes away

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Speakercraft v10 subwoofer not taking input signals


Does any other speakers work through the channels you are putting the subwoofer through? Reason i ask is could there be a fault with the channel you are using i.e AUX? is your subwoofer connected with Aux cables or is it a speaker cable? If aux cable is there a slight break in the cable?

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Have an older (6 + Yrs) VX-10A model, that's worked fine up until now. I recently moved, hooked up the same stereo and surround sound speakers, which worked fine, but the subwoofer made a loud hum as...


Disconnect the input and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

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Re: Boston digital BA735. Hum with or without input signal.


Hmmm I just got the same problem. They worked fine on my old Dell desktop but when I plugged them in to my son's old Dell PC (maybe 1 year newer than my old one) they all hum like crazy - as you say even if it's just the power plugged in and nothing else. Yes it does have the original power supply. I get no music (but still it hums) from digital out/in but when I switch to analog out/in I hear the music and it still hums, plus the sound is distorted. Wierd.

Jul 14, 2010 | Boston Acoustics BA735 Computer Speakers

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No output to subwoofer.


no that is normal if it does it wile using and ur not touching it make sure power plug isnt touching the coard. and some anps do that when they r turned up to loud. or worn input or output plug

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Connecting Powered Subwoofer to a Receiver


you will need a line-level converter to use this subwoofer- it is a rectangular-shaped box with wires coming out on one end and red-and-white RCA plugs one the other. The end with the wires coming out will hook to the receiver, and the other end will need to plug into the sub.

Feb 20, 2009 | JVC Audio Players & Recorders

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No base


Problems like this are usually the result of one of two conditions, the lack of a properly grounded phono cable connection at either the amplifier or the sub. To help isolate this problem, try plugging the end that goes to the amp into a jack such as the Tape Out. If the hum goes away then there is a problem with the sub out. If the humming doesn't change then it is either the cable or the Sub itself.
The other condition is what is known as a difference in ground potential between the amp and the sub. If both components have grounded (3-pin) plugs you may have to isolate the ground of the sub by using a 2 to 3 prong adapter and ground the sub to your receiver.

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1 Answer

Humming


Maybe one of the audio leads does not have a complete earth shield and until the second lead is connected, the lack of a suitable earth shield produces the 50Hz 'hum'.

If you should connect either of the two the centre conductors to your body, YOU will introduce a similar hum due to your body acting as an 'earth' to that signal carrier.

These are frequently common effects and it may be a good idea to turn the volume level down on the amplifier or even turn it and the VCR OFF whilst you make or break these connections.

Good Luck!

Aug 04, 2008 | JVC TH-M505 System

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Sub woofer cuts on and off.


I am an Electronics Tech and just finished repairing a LW12 for a customer. It also has the HUM. IF I place a finger on the RCA input and another finger on the heatsink..(black metal plate at the back) then the hum goes away. I did notice that Cerwin V maunfactured this older LW12 unit with a 2 prong cord. I personally own a newer CV 10" sub, 3-prong and has never had a problem with it and it has awesome Bass. So for my customer...I am thinking I will add a 3-prong cord. and see what happens.....

May 20, 2008 | Cerwin Vega LW12 Subwoofer

1 Answer

No Sound from Subwoofer


You should be able to check this yourself pretty easily, Just connect the power and turn it on. Connect an audio cable to the input. Make sure the level control on the sub is turned about halfway up or more. Now, touch your finger to the tip of the plug on the other end of the audio cable. You should get a nice hum out of the subwoofer. If not, then the sub is bad - if it has a user-replaceable fuse you might check that first. If you do get a hum out of it, then the sub is ok, and the problem is elsewhere. Might be a simple as a bad cable or an option on your amp/receiver is set wrong.

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