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? 
128x128blueranger
On common neutrals the neutral only carries the difference, if line 1 carried 10 amps and line 2 carried 6 amps only 4 amps runs through neutral, if they both carried 20 amps 0 is on neutral ,  the hots are on opposte phases so they cancel each other if they are on the same phase well the house might burn down since 40 amps could then go through the neutral wire melting it. 
The reason they used aluminum wire and rationed copper in the last half of the 1960's was the Vietnam war. I used to own a house completely wired with aluminum biult in 1967.
Post removed 
Post removed