Do your lights dim when your amp powers up?

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)

YouTuber XrayTonyB has a video on how to add a Pioneer-style soft start to any amp; it includes a relay and a hefty power resistor that functions as described above by Larryi. The current to initially charge the capacitor power bank runs through the power resistor until the capacitors approach full charge and then the relay contacts change state and the power resistor is dropped from the circuit.
 

The circuit works well because of the way capacitors charge. The curve is exponential, so that, if memory serves, 4/5ths of the current is consumed in the first 1/5th of the time it takes to charge them fully, then 4/5ths of the remaining current in the next 1/5th of the charging cycle. The power resistor is dropped out of the circuit well before it reaches full charge, but well after the capacitor bank has received the bulk of the current it needs. This way, it doesn’t kick back in during normal operation when the capacitors may need to be resupplied after heavy transient responses. At least that is my understanding.

The circuit is fairly simple and I think Tony even went so far as to come up with a small circuit board that can be installed in nearly any power amp or receiver short of a design like Devaliet (if I’ve spelled their name correctly). 

I have a 1957 house with 100 amp breaker.  I have a 20 amp line for stereo.  When I turned on the big Yamaha amp turning that on dimmed the lights.  Running the Vitamix blender made light above the sink flickered.

My insurance company put a monitor on my power to monitor for fire hazards.  I noticed voltage drops down to 106V.  Called the utility.  Turned out there was a bad ground after the transformer.  They called it a neutral.  They fixed that. Problem solve

 d.

 

My insurance company put a monitor on my power to monitor for fire hazards.  I noticed voltage drops down to 106V.  Called the utility.  Turned out there was a bad ground after the transformer.  They called it a neutral.  They fixed that. Problem solve

@daledeee1 - EXACTLY.  And a neutral is not a ground, but a lifted neutral (bad connection from center tap of utility transformer to your panel neutral) is exactly the sort of thing that would cause this.

If you noticed in my earliest reply, I suggested a cheap AC voltage meter with a built in N-E voltage display for just such a reason. 

Even with a dedicated 10 gauge outlet, if your panel's connection to the utility neutral is bad you get all sorts of issues.  The biggest issues come when we try to fix significant home electrical problems with power conditioners.  You ignore a real issue or make it worse.