Do your lights dim when your amp powers up?

PS - I almost forgot one of the most important lessons which relates this all to the need for proper wire gauges in the walls. 

Our cheap extension cord now has the following electrical properties:

4.8V across it

2.4 Amps of current

Which also means: 

4.8V x 2.4A = 11.5 W !!!!!!

That is, our cord is warming up, and releasing heat all by itself. If it can’t dissipate the heat fast enough it will melt.  I’ve you’ve followed my previous post and this one you know fully understand why even cheap extension cables have a power rating and why it must be respected!

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.