Every time my washer started a new cycle, I would get a thump out of my subwoofer due to the drop in voltage. Essentially, the voltage dropped enough so that the amp in the sub did an off / on cycle which caused the thump.
I needed something to support the AC feed very briefly -- for the fraction of a second that the voltage dips. My solution was to get a UPS. I did not need a high capacity expensive one that would support my system for hours; I just needed one that could bridge my voltage gap for a fraction of a second.
There are many. This one worked for me --
https://www.amazon.com/gp/product/B0007P11M4/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1
I needed something to support the AC feed very briefly -- for the fraction of a second that the voltage dips. My solution was to get a UPS. I did not need a high capacity expensive one that would support my system for hours; I just needed one that could bridge my voltage gap for a fraction of a second.
There are many. This one worked for me --
https://www.amazon.com/gp/product/B0007P11M4/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1