Electrical question

Get a couple dedicated lines installed.  It’ll solve your problem and likely improve your overall sound as well, and in the relative scheme of things it’s not all that expensive either. 

The house is 30 years old, best to get an electrician in here put the microwave on a separate line and a couple lines for the hifi gear. 
 

side note I drove 631 miles day before yesterday and brought back the Volti Lucera, holy cow it sounds so good..screw my ringing ears…

Have the electrician put the audio equipment on the opposite phase from the microwave , if you get a funny look from them get another electrician 

Here's the thing. I recently switched my home insurance to State Farm. They sent me a free gadget called Ting. You plug it into any outlet that doesn't get much use and it monitors your whole house electrical circuit. You get real time supply voltage and it monitors your circuit for high frequency excusions that may be indicative of arching that could lead to fires. The incoming voltage swings from about 108 to 122v due to loading on the main distribution circuit. Your microwave is a noisy culprit but a dedicated circuit will not prevent voltage swings on the incoming power. These swings are not harmful to most appliances but all electronic gear is designed around a particular voltage (usually 112,115, or 120v). It will operate just fine within a certain range but unless your voltage is consistent with the design voltage of your gear, you will not be operating at optimum regarding sound. 

No.