A friend in an apartment building had a similar problem. I gave him a large Constant Voltage Transformer that I had purchased as surplus for $60. It solved his brownout problems cheaply.
At my own home, I had the electric company increase my home service from 100 amp to 200 amp, then had new dedicated power lines run from the service box just for my system.
Good Luck
At my own home, I had the electric company increase my home service from 100 amp to 200 amp, then had new dedicated power lines run from the service box just for my system.
Good Luck