Low incoming voltage

 The Furman has no fans, but a slight hum, and slight clicking sound as it adjusts.  Available new. :)

You need what is called a "voltage regulator."

Most power conditioners don’t have this feature because it is always expensive on account of the big, heavy iron and copper parts, and for most of us it is not needed. In your case you really do. Here’s the one I use when needed:

https://amzn.to/2EmQSnn

Make sure your wiring is up to snuff, and that if you have fuses they have not been altered from code. Voltage regulators aren’t magic, they trade voltage for current, so they may push the current a little more.

If you don’t mind spending more and want all the noise and surge protection bells and whistles, this is the fancy version:

https://amzn.to/2QlEma3

Again, they key word here is "regulated." Furman makes a few conditioners which are regulated, and many that are not. Whatever brand you buy, you want to make sure it includes that phrase.

PS Audio regenerators do this, but at a severe cost penalty. Also, the Sanders Mag-Tech amps have built in compensation for this. Good amps by all accounts.


Best,

Erik