Dedicated 20 amp circuit - Electrician laughed!

I brought my electrician out to my house today to show him where I would like to install a dedicated 20a circuit for my system.  He laughed and said that's the stupidest thing he's heard and laughs when people talk about it.  It said, if you're going to do it, you have to have it separately grounded (shoving a new 8 foot rod into the ground) but even then, he sees no way there can be an audible improvement.

Now, he's not just an electrician though. He rebuilds tube amps on the side and tears apart amps and such all the time so he's quite well versed in audio electronics and how they operate.

He basically said anyone who thinks they hear a difference is fooling themselves.  

Personally, I'm still not sure, I'm no engineer, my room's not perfect, and I can't spend hours on end critical listening...  But, he does kinda pull me farther to the "snake oil" side and the "suggestive hearing" side (aka, you hear an improvement because you want to hear it).

I'm not taking a side here but I thought it was interesting how definitive he was that this not only WILL not make a difference but ALMOST CANNOT make a difference. 
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Either try an audioquest Niagara or AC filter choke and be done with all the crap
Anyone care to explain exactly what is isolating about a transformer?
An isolation transformer is a transformer where their primary winding and secondary winding are physically separated from one another. (They are not directly electrically connected.)
Not all isolation transformers are created equal. The better the isolation the better the noise on the primary winding is prevented from being magnetically induced onto the secondary winding.

An isolation transformer creates a new separately derived power system. Result, the output of the secondary winding floats above ground. Therein it does not have any reference to ground.

I would say probably most isolation transformers in use that were installed/wired by a non qualified professional, that feeds audio equipment, the secondary was left floating above ground. The NEC calls this an ’Isolated Power System’.

The NEC is very specific where an ’Isolated Power System’ is allowed. In our homes is not one of them.... Per the NEC the secondary of a separately derived power system shall be earthed, grounded, to the main electrical service System Ground. Simply put, one of the secondary ungrounded leads, legs, shall be intentionally connected to earth in a manner set forth by the NEC.

I believe your electrician friend missed the point.
When I ran my system on a shared house circuit the power drain was excessive and things would start to brown out.  Especially around Xmas when the tree was up and all sorts of electric holiday decorations were lit.  I ran my own dedicated 20 amp line to the stereo and and no more outside draw issues occured.  Nothing sounded better but my power hungry all tube system was satisfied!  I think its the smart thing to do, and very low cost, sans the cryogenic hospital grade quad outlets.
A couple of times I have tried a transformer between my panel and my dedicated run to the stereo, using a Topaz 5 kVA, 0.0005pF model.  I never really heard sonic improvements, frankly, and the thing did buzz nicely (was in a separate room!) and wasted a lot of energy in the form of heat.  But they do kill any DC on the line.  I took it out both times, and have found actual sonic improvements with the PS Audio P20 (P10's before that).
Your electrician is an idiot.  Don’t let him change a switch or receptacle.  Without an understanding of the NEC he is dangerous.

just sayin’...