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Windows 7: Buzzing sound from speakers

07 Jun 2015   #1
nishadrox

Windows 7 Ultimate x64
 
 
Buzzing sound from speakers

My PC is connected to a home theatre system via an amplifier. The home theatre system's plug is two pronged and all the plugs including those of PC and monitor are connected to the same extension cord that is connected to the wall power outlet by a three pronged plug. When I plug the 3.5mm cable from the amplifier (home theatre) to the sound card output I hear a loud buzzing sound. Please help.


My System SpecsSystem Spec
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07 Jun 2015   #2
GokAy

Windows 7 Ultimate x64 SP1
 
 

Until someone else comments - can you test the 3.5mm cable with something else? Like your phone?
My System SpecsSystem Spec
07 Jun 2015   #3
nishadrox

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by GokAy View Post
Until someone else comments - can you test the 3.5mm cable with something else? Like your phone?
Very little when plugged into the laptop with battery power
My System SpecsSystem Spec
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07 Jun 2015   #4
GokAy

Windows 7 Ultimate x64 SP1
 
 

Do you have another 3.5mm cable? You have to try another cable on your system and also try that cable on some other system to eliminate possibilities.
My System SpecsSystem Spec
09 Jun 2015   #5
nishadrox

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by GokAy View Post
Do you have another 3.5mm cable? You have to try another cable on your system and also try that cable on some other system to eliminate possibilities.
Same outcome mate
My System SpecsSystem Spec
09 Jun 2015   #6
fireberd

Windows 10 64 bit
 
 

Sounds like a "ground loop" hum. Usually, lifting the AC power ground on one piece of equipment will correct this. With a two prong AC power cord, reversing the cord will sometimes fix it.

I used to be a guitar amp tech and ground loop hums are a common problem in musical equipment.

In reference to the cable, it should be a shielded audio cable, not a "speaker" or speaker extension cable as they normally are not shielded.
My System SpecsSystem Spec
11 Jun 2015   #7
nishadrox

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by fireberd View Post
Sounds like a "ground loop" hum. Usually, lifting the AC power ground on one piece of equipment will correct this. With a two prong AC power cord, reversing the cord will sometimes fix it.

I used to be a guitar amp tech and ground loop hums are a common problem in musical equipment.

In reference to the cable, it should be a shielded audio cable, not a "speaker" or speaker extension cable as they normally are not shielded.
What is "reversing the cable"? Please explain.
My System SpecsSystem Spec
11 Jun 2015   #8
fireberd

Windows 10 64 bit
 
 

Reversing the cable? On an AC power cord with a two prong plug, reverse how it is plugged in to the AC receptacle. If its not a "polarized" plug (one lug is wider than the other) its easy to reverse. If it is a polarized plug and adapter is needed.
My System SpecsSystem Spec
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