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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Sun Oct 25, 2009 1:06 pm Post subject: Radio Interference through Sub output |
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So I finally finished running all the cables in my home theatre, nothing is running across the floor any more 
But now I have a problem, when the cable that goes to my subwoofer from the receiver is connected to the receiver I pick up what I believe is radio thorough the receiver. It shows through all speakers except the sub and it's always at the same output level, regardless of the volume setting on the receiver. The only way to get it to go away is to mute the receiver or disconnect the sub output cable from the receiver. Disconnecting the cable from the subwoofer has no effect so it is definitely the cable that is causing the problem. I tried re routing the cable as much as possible but the problem persists.
I had this same problem with a previous receiver I had and thought it was the receiver but I guess I was wrong...
Any suggestions on how to get this to go away.
Chris.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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WanMan
Joined: 19 Mar 2006
Posts: 10270
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| Posted: Sun Oct 25, 2009 1:56 pm Post subject: |
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This reminds me of Gilligan in the episode where his dental problem resulted in him picking up a radio station.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 2:53 pm Post subject: |
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If you were to flip the receiver to tuner is it the same channel thats playing? And if the answer is yes or no, change the channel and see if it goes away. If it still doesn't go away change the tuner to AM and see if it go es away.
If it still doesn't go away, what make and model receiver?
Oh, try disconnecting all inputs and see what happens.
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Sun Oct 25, 2009 3:18 pm Post subject: |
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The receiver is a Yamaha HTR-6160. Tried disconnecting all inputs, no luck, tried checking the tuner and as I don't have an antenna connected I can't pick up any radio stations AM or FM. I tried changing the frequency that it was tuned to and no change.
The only think that will make it go away is to disconnect the subwoofer cable from the reciever.
I'm going to try to find a ferrite core to put around the cable to see if that helps.
Chris.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Oct 25, 2009 3:27 pm Post subject: |
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Chris do you have the cable connected correctly? As in the ground is on the receiver side, that might help also.
Also if you can tune another radio to the same station your hearing over the speakers then you'll know what frequency you need to get rid of in the cable, So times its best to loop the cable in the ferrite core once if there is room. So you might need to get a larger ferrite core, or even an an old Choke inductor from an old power supply.
Athanasios
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 3:43 pm Post subject: |
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Is this receiver in the exact same location as the other receiver that was also picking up this noise?
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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| Posted: Sun Oct 25, 2009 4:34 pm Post subject: |
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| macgyver655 wrote: | | Is this receiver in the exact same location as the other receiver that was also picking up this noise? |
No.
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nuttall_chris
Joined: 08 Mar 2006
Posts: 832
Location: Ottawa, Ontario, Canada
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 4:59 pm Post subject: |
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At this point I would try the ferrite core that Athanasios suggested. If I think of something else I'll post back.
You may want to contact Yamaha as they sometimes have solutions for this type of interference with their own equipment. Its not uncommon..... 
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bbfarmht
Joined: 27 May 2006
Posts: 1273
Location: Where the Mississippi runs east to west!!
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| Posted: Sun Oct 25, 2009 5:03 pm Post subject: |
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Doesn't the sub cable have a north south orientation. Maybe try flipping it around and try that otherwise you might have it running past something else that is carrying a radio signal.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 5:08 pm Post subject: |
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Is this a powered sub? (I know you said its still there with the sub disconnected)
I guess I'm asking if this is a preamp output.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Oct 25, 2009 5:24 pm Post subject: |
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Most , or all RCA cables should have one end grounded, the shield usually is the ground, that end should be on the end that you connect to the receiver as most powered subs have only a two prong plug not three. if it s a three pronged power cord for the sub then the RCA should also meet the ground at that end. Also if the outlet you plug the sub into is on a different circuit than the rest of the audio system you can get ground hum or sometimes the radio interference you have.
nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 6:25 pm Post subject: |
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| Nashou66 wrote: |
Most , or all RCA cables should have one end grounded, the shield usually is the ground, that end should be on the end that you connect to the receiver as most powered subs have only a two prong plug not three. if it s a three pronged power cord for the sub then the RCA should also meet the ground at that end. Also if the outlet you plug the sub into is on a different circuit than the rest of the audio system you can get ground hum or sometimes the radio interference you have.
nashou |
I think you missed the part in his post where he said the interference is there even with the sub disconnected. Just the sub wire is still connected. The ground loop issue would not apply.....
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bbfarmht
Joined: 27 May 2006
Posts: 1273
Location: Where the Mississippi runs east to west!!
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| Posted: Sun Oct 25, 2009 6:39 pm Post subject: |
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| macgyver655 wrote: | | I think you missed the part in his post where he said the interference is there even with the sub disconnected. Just the sub wire is still connected. The ground loop issue would not apply..... |
Hell my A.D.D. is kicik'n hard right now, cause I read it understood it and ignored it. Because I was thinking the same thing as Nash was.
I really need to get on meds for that. 
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Adam
"Any society that would give up a little liberty to gain a little security will deserve neither and lose both"
Benjamin Franklin
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 6:45 pm Post subject: |
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This phenomenon has me most curious since it appears to be induced electromagnetically. Another odd factor is that you say you can mute it with the receiver mute but cant change volume. Would this also be true if you turn volume fully off?
Also that fact that you had the same problem with another receiver. What was the make and model of the other receiver?
Also I am curious how many speakers you have hooked up and EXACTLY which speakers the interference comes out of.
Was it all speakers except for the sub meaning you listened at each speaker and heard the interference?
I'm trying to figure out what section of the receiver the interference is being introduced.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 6:51 pm Post subject: |
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| bbfarmht wrote: | | macgyver655 wrote: | | I think you missed the part in his post where he said the interference is there even with the sub disconnected. Just the sub wire is still connected. The ground loop issue would not apply..... |
Hell my A.D.D. is kicik'n hard right now, cause I read it understood it and ignored it. Because I was thinking the same thing as Nash was.
I really need to get on meds for that. |
Thats why I try to pick out every detail in someones explanation, but I do the same thing on occasion...... read it and then forgot about it...... must be old age.....
Got more of them meds? 
Thats also why I sometimes ask very picky questions....to make sure I'm thinking on the right track. I've had a few times lately where after 20 posts the person with the problem posts another symptom and it completely throws out the solutions I was thinking.
All symptoms are important....
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 25, 2009 7:05 pm Post subject: |
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| Nashou66 wrote: | Your right Ron, I knew he said that I just forgot he disconnected it at the sub end, but still if the Ground end is not connected at the receiver end then it could possibly transmit any radio frequencies into the Audio section instead of finding the least resistive path to Ground. Right or wrong?
Athanasios |
Only if its a frequency being carried on a signal in the line itself. In this case its a radio wave and the wire itself is not causing the problem. Its the wire along with other components in the receiver. Or even other devices in the rack which is why I asked if both receivers were in the same location.
I'm not saying I understand the answer yet which is why I asked more questions.
All I know right now is its the magnetic field of the receiver probably encompassing the sub wire to pick up the radio wave of that particular frequency. This is also why I asked if its a preamp line. To see if its pulling that radio wave into that section as it is mutable. The output section is not mutable. It would then matter if its induced into all preamp signals.
This is why I'm curious...
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Oct 25, 2009 7:28 pm Post subject: |
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Ok I understand now what your looking for, and it makes perfect sense. Do you think if something in the receiver is using the sub wire as an antenna that connecting the sub wire with its Ground connected to the receiver end would help minimize it? I remember having a similar issue on my one surround amp and i had the grounded end of the rca on the amps side and not the receivers side and changing them around reduced it to the point is was barely audible.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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