The phenomenom that you are describing is the same one that makes equipment or wires sound different even when there isn`t any difference. This doesn`t make it less real-it is for you. Now, of course, those having a product to sell you to "solve" your problem, will tell you that the voltage changed or the power grid was noisier the day before and you should be using his/her new power conditioner or cord.
Enjoy the fact that you enjoyed the music that day-maybe better accompanying wine?
Enjoy the fact that you enjoyed the music that day-maybe better accompanying wine?