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I have 5.1 surround sound and when watching a movie, random crackling noises come out of the front left channel. This does not happen on a consistent basis - it is totally random. I thought it might have been the speaker wire, so I replaced the wire and that didn't work. Then I switched both the left and the right front speaker and the right front speaker that was performing fine started to make the noise when hooked into the left front channel through the receiver. So, I think I have it narrowed down to the receiver. I have a Marantz SR7200 AV Receiver if that helps. Do you have any ideas or solutions?

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  • nowicrob Jan 18, 2009

    Since it is only the front left channel doing it, is there a way to clean the input jacks into the receiver. Maybe it just needs to be cleaned out??

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Crackling noises on an audio channel means that there is a short. I do not know what you mean by cleaning jack (it should be RCA or similar, not jack), but since the problem is clearly the receiver, the unit must be taken apart and the contact originating the short fixed.

The contact is usually on the small input board that is hosting the audio input sockets.

The repair is not expensive, but by calling your TV company you can get a replacement receiver.

Posted on Jan 20, 2009

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Welcome to Fixya! This is a Reciever Problem. You have a Faulty Amplifier that is not Reading the 5.1 Correctly and Switching Indetween. This is Common on Marantz units. I would locate an Authorized Service Center and have them Replace the Amplifier in the Reciever.

Posted on Jan 18, 2009

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Sir,

I guess the broken driver is one of kef's top end uni-q dual concentric tweeter/mid range units so I guess it would have to be replaced as an item, rather than just replacing a broken tweeter or midrange.

If it is then the prob lies with the speaker, if the crackling comes from the right channel then its the amp at fault.
If the fault lies with the speaker an easy way to check is to remove the grille, then with two thumbs either side of the bass cone (near the centre), press GENTLY inwards then release (repeat as neccessary) and listen/feel for any roughness or grating. If it does this indicates the voice coil has "burnt out" as they say. The cone of the speaker should move in and out under finger pressure with no noise/grating if it is OK.

The tweeter cost is 15 $ - 20$

thanks
goodluck

Posted on Jan 18, 2009

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May be some other magnetic field or device close to it is causing interference.check and move it away to get rid of this diturbance.

Posted on Jan 18, 2009

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Check the output jack in the 5.1 device
see if anything wrong in it 
speakers wil be allright only the 5.1 seperator hav the fault

Posted on Jan 18, 2009

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Insure you have the speaker wires connect with the proper polarity (plus minus). and that nothing is near the reciever that may be causing interference.... computers are the worst offenders for causing interference with devices

Robert

Posted on Jan 18, 2009

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Posted on Jan 02, 2017

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