Many Power Suppliers cut back the voltage (slight brown out) during peak usage hours to protect the grid, especially during a summer heat wave. This morning my house measured 115 VAC, during the heat of the day it was down to 100 VAC. Tonight, it's back to 115 VAC. As a side note, I thought the sound was slightly distorted during loud complex passages, so I shut my system down and jumped in the pool.
In the red; insufficient power
I use a Panamax Maxx 1500 line conditioner for my source components (My power amp is plugged directly to the wall outlet). The Panamax has a row of LEDs across the faceplate, running right to left, red to green. Most of the day the Panamax reads down into the reds (danger; insufficient power). The LEDs are also marked to approximate the AC voltage, from 95 up to 115. It is only during the early morning or evening hours that the Panamax indicates sufficient power. I am guessing I need to hire an electrician to run a dedicated line to my listening room. Any other advice or observations? Thanks.