Dedicated 20 amp circuit - Electrician laughed!

piaudiol - you're absolutely right

All single grounding electrodes must have a resistance to earth of 25 ohms or less - if not, you must add additional electrodes and "daisy chain" them together.

I ran a quad shielded 10 wire directly to the panel on a 20 amp circuit. I installed another grounding rod attached to the original grounding rod, about 5 feet apart. I used an AQ plug in the wall that has a very tight connection. The voltage drop is less than 5 percent at the plug. Throughout the rest of my old ranch house, I have endeavored to rewire with quality parts, such as a $5 dollar plug vs a 79 cent plug. If I could start with a clean slate in a new house, I would be careful to select the best parts available. There are panels that have thicker copper bus bars. I would say that the more robust your electrical system is, the likelihood of better performance with whatever you're plugging into it is ensured. When I ran the dedicated circuit for the main system, I believe that things got quieter. I do have things plugged into a Furman Elite 20PFI, mostly for protection from spikes. If you don't want to run a dedicated circuit, then I would at least install a quality plug and tighten up connections at the panel. Electrical systems require maintenance just like anything else. I am seeing million dollar homes getting built in my neighborhood as older homes get torn down. These homes likely have the cheapest parts installed that is required to meet code. When the "amazing" builder gets estimates from three electrical contractors, he doesn't select the best man for the job, he selects the cheapest. Modern electrical systems are designed to last about 10 years.  

Listen to him. The man is saving you a lot of potentially wasted money.

LOL.....   after so many miles of garbage quality transmission lines and grunge being put into the lines you think cleaning up the last few feet is going to make a difference?  REALLY?

Luckily. I have an electrical background as it was my major at my vocational high school I attended, and so I have no fear with most DIY electrical work. What prompted me to install a dedicated 20 amp circuit for my system was the lousy 15 amp existing circuit available in my living room. This circuit ran everything in the room of course, the tv, fans, plugged in table lamps, etc....everytime I’d play my system rather loud, I’d notice the lights dimming noticeably while plugged into the existing 15 amp circuit. This to me was annoying and unacceptable. So I gathered all necessary supplies (12 gauge romex, a handi-box, audioquest NRG copper receptacle, and a new 20 amp circuit breaker) and I got to work! It took me about 4 hours time to complete (about a 40 foot run, due to proximity of panel to room), but well worth the effort and the cost savings of doing it myself. I can say that there are no more dimming lights, and I can honestly say that I noticed that the system seems quieter, a darker back ground so to speak. I added to this by utilizing an audioquest niagara 1200 power conditioner as well as AQ thunder power cord for amp, and the NRG X-3 cords for sources. To me it was all a worthy cause, and actually a fun project. One thing to add about the AQ NRG receptacle is that it grips the power cord prong like a gorilla...you need to be Hercules to remove the plug now...unlike the cheap ass receptacles that are loose....