6-channel direct input humming

[alonbl]

I have a humming noise coming out of the speakers from the 6-channel direct input form the PC. However if I choose the play from the optical input there is no humming. I tried to reconnecting the coaxial cables but it didnt solve it.
I didn't see any grounding cable from the receiver.
I got: Speakers: Yamaha NX-P120 & Receiver: Sharwood RD-6405R

Please help me stop the humming! 🙂

 

[vshah]

sounds like you have a ground loop somewhere. try running an extension cord from another part of the house and putting the receiver on that plug.

 

[NutBucket]

Or buy a few ground loop isolators for the RCA connections.

 

[alonbl]

I dont have other plug. Aren't ground loop isolators reduce the sound quality? and if not which model/company you recommend?

 

[NutBucket]

You can always return them if you don't like them but I've never had an issue with SQ.

 

[alonbl]

The rules here are different. I can't return it if its working, only if its damaged or something I can.

 

[Number1]

You might have a bad cable on one of your 6 channel input.
Disconnect them all and plug them in one at a time until the hum is back.
Replace the offending cable.
Enjoy.

 

[alonbl]

Indeed Walter White that was the problem. I changed all the cables to new thick ones and it worked.

 

[NutBucket]

Glad you got it figured out 🙂

 

[alonbl]

I bought this for the sub (which gave the most hum before):

so now I have a spare cable too 🙂

 

[Number1]

Indeed Walter White that was the problem. I changed all the cables to new thick ones and it worked.

You most likely did not have to replace them all but hey, its working now... Good for you.

:thumbsup:

 

[alonbl]

You most likely did not have to replace them all but hey, its working now... Good for you.

:thumbsup:

I checked them all and all made noise.

 

[Fallen Kell]

Sounds more like a shielding issue than with the old cables. The new ones probably have a foil or mesh shield...