Power consuption of an amplifier

In the US, when you plug an appliance into an outlet, that appliance cannot draw more than 1800 watts because the receptacle is rated at 15-amps. The closest equivalent power source is the 1500 watt transformer.

Keep in mind the transformer wattage is the maximum it can handle and therefore you can go for a bigger VA or watt rating than the amplifier. Going smaller will affect the amp's performance as it will sag voltage at low impedance loads.

(That wall outlet that is rated for 1800 watts is fed by a pole transformer that can deliver hundreds of thousands of watts to your house yet your appliances don't care).

gs5556, thanks for your advice.

If I understand right, if power consumption will exceed max power of transformer, the transformer will just turn off because of built-in protection.

The transformer is a passive device, it literally passes voltage and current that is fed into it. A higher wattage transformer has thicker wires and is able to carry more current and therefore more power. If the transformer is undersized for the load it will overheat and damage. The size of the transformer you pick is based on economics. As an extreme example, you can hook up a 10,000 VA (watt) transformer to a load that only consumes 1 watt. Since you have much more capability than necessary, you paid for all that copper, size and weight for no reason and the job would have been done no different with a 1 watt transformer.

Your amp is made to work in an 1800 watt outlet. Therefore you should ideally select an 1800 watt transformer. In your example, the 1500 watt unit is the closest. No need to go smaller as it may have an effect on performance.

Gs suggesting getting welding transformer...