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Thread: Humming sound from speakers |
    
Bronze Member Username: Kinggimp82
Post Number: 26
Registered: May-05
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| Posted on Sunday, December 18, 2005 - 03:47 pm: |
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i have a cord running from my pc to my reciever. when no music is playing my speakers make a humming sound. is this normal or can it be fixed? |
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Gold Member Username: Jan_b_vigne
Dallas,
TX
Post Number: 6941
Registered: May-04
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| Posted on Sunday, December 18, 2005 - 06:54 pm: |
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It depends on how loud the noise is. Do you have the PC and the receiver plugged into the same AC circuit? |
Bronze Member Username: Kinggimp82
Post Number: 28
Registered: May-05
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| Posted on Monday, December 19, 2005 - 05:08 pm: |
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the pc is a seperate room. the noise isnt all that loud but its irritating. the higher i turn the volume on my reciever the louder it gets. but when music is playing i dont notice a sound. |
Gold Member Username: Project6
Post Number: 4522
Registered: Dec-03
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| Posted on Monday, December 19, 2005 - 06:05 pm: |
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How long is the cord? |
Gold Member Username: Jan_b_vigne
Dallas,
TX
Post Number: 6948
Registered: May-04
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| Posted on Tuesday, December 20, 2005 - 12:36 am: |
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You have a different ground potential on the two systems. There is no easy way around the situation without either arranging the systems to both run off the same circuit breaker, have a common earth ground or possibly lift the ground from one end of the system.
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Gold Member Username: Frank_abela
Berkshire
UK
Post Number: 1089
Registered: Sep-04
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| Posted on Tuesday, December 20, 2005 - 10:48 am: |
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Jan is on the money. It's an earth loop (for more info about earth loops see http://www.jaycar.com.au/images_uploaded/humloop.pdf).
I see you say PC to receiver. Is this a coax or fibre optic connection? If it's coax, switch to a different source. If the hum is still there (should be), disconnect the coax input from your PC and the hum should go away. If this happens, it's definitely the earth potential. You can get around this by changing the coax to a fibre optic connection, effectively breaking the loop. Of course, if you're using the PC's built-in DAC, then I'm not sure how you could break the loop.
regards,
Frank. |
sanjay sh Unregistered guest |
| Posted on Wednesday, December 28, 2005 - 11:20 am: |
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use very good quality rca good shield cable if connection very long.
use good sound card like creative 24 bit.
your pc power supply might not be good.
can give out rf interference.
switch off the pc and check hum level.
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DeathToEarthLoops Unregistered guest |
| Posted on Thursday, January 12, 2006 - 04:32 pm: |
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Earth loop it is! I had the same problem; my receiver is connected to both TV and PC via ordinary sound cables, the PC is grounded via powersupply and the TV is grounded via the coaxial antenna cable. Let the humming begin...  I had to unplug the antenna cable (easiest one to reach) in order to avoid the humming. But today, I bought one of these:
http://www.apcc.com/resource/include/techspec_index.cfm?base_sku=PF8VNT3%2DGR
Now I run the antenna cable through this box, and then the electrical ground and antenna ground have the same "zero", so there is no current in the earth loop. Hey presto, all problems solved! And the gizmo even protects your stuff from lightning etc., and for me it's a bonus! Buy one!! Highly reccomended. |
