I have a question about the AC to DC power supply. Why the toroidal transformer typically used in home amps (or all the AC amps) draws only a little bit of amperages from the wall outlet compared to the car amps for the same power output of 400 W? What is the difference? Is it possible to buy a raw toroidal transformer for very cheap and connect it into the car amps?

For example, my QSC 850 amps only draw about 5 amperages for the 4 ohm 600 W output. How can I achieve this with the car amp?

I am sorry if this may seems stupid. But, I want to know more about amplifier technology.