I actually have experience with this! Had a very nice large A.B.B. control system installed at a storm water station and any little thing would send it into alarm. What we did not know was if you have anything on the circuit with capacitors or high on off frequency you will get ringing in the circuit and cause frequency distortion. Turns out hospitals, inspection terminals and microwaves will do this. So, with all that said the electrician is wrong and their is a gain to having a clean, dedicated circuit for you system.
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.
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.