Am I hearing things?

I just an extra new dedicated line run beside the other one. with 10 gauge wire, 30 amp breaker and a 20 amp rated outlet. I don’t think it sounds as good!!!

@blueranger

Just a guess a licensed electrician did not install the new wiring. A qualified licensed electrician would not install a 30 breaker to feed a 20 amp rated receptacle. The 30 amp breaker should be replaced with a 20 amp breaker. (The contacts inside a 20 amp breaker are the same as found in a 30 amp breaker. Exactly the same. Only the thermal and magnetic trip units are different.)

What type of wiring did you use? 10-2 with ground Romex?

Is the new circuit installed on the same Line, Leg, as the other dedicated circuit? In the same area space in the electrical panel as the other circuit’s breaker?

One thing you should check is to make sure the AC polarity is correct at the receptacle outlet. Go to Home Depot and buy a cheap plug-in circuit/polarity checker to make sure the polarity is correct.

blueranger,

I have not seen very plausible looking arguments to establish that all those things need "burn in" and change sound.

But it is very well established that our perception alters readily.

On an anecdotal level: I often play around with the positioning of my speakers, distance, angling, height, tilt, just to test stuff out.

I notice that some times I’ll do something like raise and tilt the speakers a bit, and it may result (due to acoustics) in an alteration of the sound that I find a bit good, a bit bad. Say, a little more emphasis in the presence region, a bit less warmth down low.

But over time, I adapt. A week later, I may either find myself MORE cognizant of the things I don’t like, or LESS so. For instance, I may no longer perceive a lack of warmth, and now it sounds "right" to me. Nothing has changed physically about my system; my brain has adapted,  changed my perception.

In fact, it’s been a subject of discussion at various points on here and other forums that the way we perceive our systems can seem to change even daily. What was "wow" yesterday may seem "Meh" today.

Maybe you do have some issue on your AC line causing what you hear.But in terms of "break in" being the issue:


Consider the elasticity of our perception, against whether there is really good technical reasons to think your new AC line needs "break in."

Is it possible that this is a warm-up effect?

Electronics can perform better with warm-up. I find that my amps improve for about 16 hours, my preamp for about 4.

So, if you plug into one outlet and let everything warm up for ages, it will sound very good. When you power it down, change outlets, and power it back up, it won't sound good for some time, until it has warmed up for an equivalent period. 

That is, if your equipment is subject to the same limitations as mine. Could this be the source of your observation?

Am I hearing things?

Yes

General contractor here. You can NOT use a 30 amp breaker with a 20amp rated outlet. It could over heat and cause a fire. 
Fix that ASAP and stick with a 20amp outlet and you should be good. You shouldn’t need more than 20 for audio.