2. analog
  3. 166562-151430

Ground Wire

The tonearm cable is plugged into RCA input of the phono stage. The tonearm ground wire is connected to the ground post of the same phono stage. The first RCA L/R outputs of the phono stage are connected to a pair of mono blocks. There is no hum I could hear coming from the speakers connected to them. The second L/R outputs of phono stage are connected to the line input of the integrated amplifier that drives a second pair of speakers. That's where the hum is quite audible. That integrated amplifier also has the ground post. I wonder if I could get rid of the hum by connecting the phonostage's ground post with the ground post of the integrated amplifier. What kind of wire should be used to connect two ground posts of two different preamplifiers? The units are at least 8 feet apart. 
esputnix
speakermaster
738 posts
 
the hum is caused by using components on two different ground potentials you need to use all of the amps on the same outlet or you will have these sorts of problems.
pedroeb
493 posts
 
Perhaps the most important consideration is not to create a grounding loop. In that regard every piece of equipment should be connected to a central point.

Sometimes it can be excessive hard when using RCA as the shield serves two purposes: the second side of the signal and a grounding path. With balanced or XLR one end of the shield can be disconnected if absolutely necessary when a groundling loop is created.
fiesta75
1,378 posts
 
Good suggestion to use XLR's, but how is that going to help the OP? It doesn't appear that he has XLR's...
plumptonvinyl
49 posts
 
Hi Everyone,

I have a similar humming/ buzzing from my speakers when I connect my Bluesound Node2i.
as soon as I plug the power in the buzz starts.

when you  say @speakermaster, connect to the same outlet are you referring to the same power lock?

would this be apply the same to all components?
so I have turntable, phonostage and Bluesound Node2i Steamer with DAC built in.

could the issue be the Bluesound is  two pole power lead (Double Insulated Product). My amp and Turntable have 3 way grounded power leads. 
Is there a conflict?

I hope this all adds to the original question.

thanks


plumptonvinyl
49 posts
 
That should read power block
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