How to guarantee to lower noise- ground loops in your system


I have been through many problem area where noise in the  audio chain was a problem.
my friend Who is a Electrician solved the problem . All too many times people add a dedicated 20 amp circuit 12awg is standard 11-10awg even better lower resistance , also most important 
you need a Isolated dedicated ground, this is totally insulated right back to the earth ground in the 
breaker box this will dramatically lower your noise floor and remove ground loop problems .many people just put a dedicated line and think 
that’s it ,not so, if you are going to go through the trouble, then  for maybe $100 more the isolated dedicated ground  to the dedicated circuit is a must. I can tell you without question .
my Audio has a noticably quieter background .in songs i now hear low level musical artifacts like reverb off a guitar fading cymbals and clearer seperation of instruments .well worth the effort .Hopefully 
this will help others .this is a essential system upgrade .
128x128audioman58
Guys,

Can anyone recommend a good dimmer switch? I do have an old school dimmer switch on some incandescent lights and imagine that could be adding noise also.

Will have an electrician come out to look at box, check ground and possibly separate audio system outlet from other devices if that's still recommended.

Thanks,
Wig
I have about 30 Leviton DSL06
Plus several Leviton TBL03
Plus one DSE06-10Z low voltage
All high-quality LED lighting. Some cheap LED lamps generate noise.

ZERO measured noise regardless of how many are on or in what position.
I spoke with my electrician today anything else but your home theatre,audio system should be on a seperate lines .  my dedicated line has 4 wires 2 grounds a bare wire ground ,and  a dedicated insulated ground ,this Is what
sensitive instruments use,sensitive hospital testing equipment, as well as recording studios.Iam very happy with the results.
What many people don’t realize no matter how good your equipment design is if you are feeding ground off 
the same circuits you can pickup noise 
thst is why my electrician installed a dual ground one is common ground with other chains back to the breaker ground ,the others is totally dedicated and insulated back to the box this way no chance of contamination .he has 
installed the same setup to several recording studios .a noticeably blacker 
back ground then before .
@volumizer, so if using 12/3 instead of 12/2, you would have an extra conductor. This would need to be tied off so it is not connected, correct?
I understand the benefit of twisted cables, although I have never heard of anybody doing this.


Yes, you have an extra conductor, and it it not connected on either end.  I'm not sure, but I think it acts like shielding with the twisted Romex.