Most types of audio amplifiers have a power supply built in. That means that the power cord is connected directly to the amplifier. All you need to do is to connect the power cord with an outlet and you will be all set. However, keep in mind that some products are designed for different voltages. That is because some countries have a 120 V power supply voltage while others work with more than 220 V.
In that case you might have to flip the switch depending on the mains voltage so that the power supply will work properly. Some power supplies are not able to tolerate the wrong voltage and thus checking the input voltage is crucial. However, some amplifiers don’t come with their power supply. Instead, they will have a power connector at the rear which requires a specific voltage.
In order to operate such an amplifier, you will need to source a suitable power supply. To do so, first of all establish the type of connector which is required. There should be a drawing indicating what sort of DC connector is needed. There should be an outer diameter as well as an inner diameter which you will have to note. Next, write down the supply voltage. Many power amplifiers will work with 12 V or 24 volts. After you have noted the above parameters, you can start searching for suitable power supply.
Most people prefer a switch mode power supply. Such a power supply offers the advantage that it will work with pretty much any mains voltage. So if you were to move to another country, you could still use the same power supply. However, in that case you might need to purchase a travel adapter. The adapter will allow you to plug in the power supply if the mains outlet is a different design then the power plug.
In addition to the DC voltage, you will also have to pay attention to the current. The higher the current the more wattage the power supply can deliver. You don’t need to buy a power supply that offers more wattage then the amplifier can deliver at most. You simply have to divide the maximum wattage that the amplifier can supply by the supply voltage. Then add another 20% and you should have a current rating to look out for.