Do your lights dim when your amp powers up?

l would have thought all high quality well designed amps would have slow start up circuits. To avoid a switch on thump, and to protect the electronics. Even my 12 volt  DC phono amp has it. 

@erik_squires - you are right, I was thinking about how I tried to use a low gauge extension to an iso transformer to power my  tone arm air compressor and it blew 20 amp fuses on the transformer, given that those are motors. Thanks for correcting. Bill

If your lights dim you need either a higher 200+ amp service at your breaker box, 

And or a dedicated  20 amp  dedicated line for your amplifier or line conditioner .

In rush current and voltage droop. Normal. 

Mine are 100% NOT, I use a LiFePo battery and an Exceltech inverter for clean and abundat current ;-)

I use a 2000w inverter, but if you have super power hungry amps you may just add more, batteries are good for 100A at 120V (200A for th 52V nominal)