Why use ground wire from preamp to amp???


I am buying new cables from amplifier surgery guys in downers grove, IL.  

The cables are nice looking, shielded, silver solder, cardas connectors silver plated, all silver solder used, silver tinned strands,Yatta  Yatta  Yatta, ok whatever,  


Their reference rca's come with the third ground wire? They said hook it to the preamp ground?

 This is not for phono connection, why would anyone hook a ground wire to preamp when not using the turntable?  I have never heard of this before, would this be dangerous, if some current or noise is sent down the ground wire directly into the cables at the input of the amp??  

Why even have them?? What is the purpose, or have I been out of the game too long?

shouldnt I just order regular reference rca's without that silly third ground wire which serves no purpose unless hooked up to a turntable???

HELP ME UNDERSTAND, PLEASE



128x128arcticdeth

jazzonthehudson said:

The interconnect RCA are mostly only grounded on the source side as the manufacturers know there may be a ground differential so they use use this workaround for, again from the ground differential point of view, possible deficient systems.


What you speak of is the shield of a shielded interconnect cable.

My post refers to the signal ground return wire of an interconnect.

Now in the case of a coax cable the shield and the signal ground return wire are one in the same and the shield must be connected to the connectors at both ends.

 

infection said:
My Tannoy DC10T's have a ground/earth input...




http://www.tannoymarketing.com/WebServices/dh.ashx?t=qv&v=9309

"Tannoy’s unique fifth

speaker terminal electrically grounds the driver

chassis, reducing potential sound degradation form

radio frequency interference. Eliminating potential

RF ‘noise’ enhances midrange clarity and allows

Definition to deliver an even more expressive

musical presentation."

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Are you using that? Where did you connect it to?

/jea48: you're absolutely right. I must have a brain fart then, I meant the shield for an interconnect.

Anyway, star grounding is recommended to avoid hum.