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Is grounding with RCA is safe?

Hello, 
I would like to ask if grounding with RCA is safe? What I have done is I solder one end the wire to the surround area of the RCA male plug (not to it's core) and the other end to the ground prong on the 3-prong male AC plug. 

Then I plug the RCA male plug to a female RCA  on pre-amp , amplifier, DAC and the AC plug to the wall. 

I can hear the sound quality improvement and want to leave it like this. 

My question is if this setup is safe for audio equipment? 

Thank you. 

Huy
Ag insider logo xs@2xquanghuy147

Showing 1 response by erik_squires

erik_squires
15,933 posts
 
I wouldn't say it is unsafe, per se, but many designers deliberately lift the ground to prevent noise issues. Seeing a 100 Ohm resistor between the chasis, which is directly attached to the AC ground, and the signal ground is quite common. 
The quietest systems I've ever heard completely isolated the signal ground from the AC ground, preventing ground loops altogether.

I would not encourage anyone to start hacking this way.
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