On Nov 30, 11:41*am, Art Todesco wrote:
I have been having a problem with my computer speakers. *They, for
no apparent reason, start buzzing very loudly. *I've determined
that, if the speakers are powered with a slightly high power line
voltage, they will indeed buzz. *I tested this by plugging the wall
wart into a Variac and monitoring the voltage with a DMM, not true
RMS, actually a Fluke 8020A.. *At about 126 volts, the buzzing
starts. *Today I came into the house and noticed beeping from my
computer's UPS. *It was definitely in the "power out of range, use
the batteries" mode. *The inverter was humming and there was some
heat coming from the heat vents on the UPS. *After checking around I
measured the line voltage at 127 volts. *I thought this was a bit
high so I called the power company. *They indicated that this was
NOT considered high, but are sending out a tech anyway. *So, my
question to all you experts out there, what is considered high? *My
UPS thinks it's high. *My speakers don't work, but, I know they are
cheapies.

One possibility is that you have a loose neutral (neutral line not
making full and complete contact) someplace. For that matter do you
have a grounding rod installed to your service panel?