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!!! What the hey. A little shrill in both vinyl and CD. I'm comparing from what it sounded like last night. Does electricians wire, breaker and outlet have to burn in? Am I alone in this. I'm have a whole system AC but in and the temp got up to 80. Maybe that is why. Also I'm listening at 11 am EST. So the power grid may have an affect. Did I just answer my own question or have other people experienced this. The original dedicated line was put in in 03 with 12 gauge wire, 20 amp breaker and a 15 amp outlet. Are these 2 lines picking up interferrence? 
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I have a PS 1000 power regenerated and sometimes I have my 14bsst 600 watt amp run into it. It never seem to suffer from dynamics but what technical people have said here is that the punch and dynamics have to be compromised to a degree. The 1000 can only handle up to 7 amps and up to 10 soft.. The Bryston pulls more. I couldn't tell a difference so I thought my wiring was a choke point. Oh thanks for the responses everyone. My 14b3 has just left Bryston and I'm making a good home for it here.
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I totally agree with cleeds.
The exception would be a 30 amp breaker with the correct size wire feeding a sub-panel and from the sub-panel use 20 amp breakers with the correct size wire.
I also agree with others that said to use the new dedicated line and outlet for some break-in time, I don't pretend to totally understand the concept but break-in time is important. When you aren't listening to the system run a fan on that new dedicated line and outlet.
Im running system 24/7 breaking in the refurbished  Marantz SA-10 and BP 17 demo unit. The SA-10 hasn't changed that much compared to when I first got the SA-8005. I will get tbe 14b3's cherry. I will break her in good!!!
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