Ground net

Hi!

I need suggestions for a zero result.
I have read of putting the ground of the circuit to the ground of the earth via RC with R = 470KOhm and C = 1mF.

At the listening test the result is very little.
I have thinked that 470KOhm can be exagerate, and maybe 1mF also.

In your experience, what do you suggest?

Thanks,
Bye!
 
You are right. I have a passive pre amplifier. Normally the ground is unplugged. Now I have read that is better to connect the ground to the electrical system of the house.
Better again, is to insert in serie to this ground a net filter with RC in parallel.

I hope to be understandable now.
Thanks!