110 Volt converter
Converter for 230 Volt to 110 to 120 Volt. Just use the standard plug "in the Netherlands" and you only have to switch on the device. The box already has an American "socket" built in where you plug in a 110 volt amplifier.
Make sure that the power consumption of the amplifier does not exceed the maximum capacity of the converter. Also always take a converter with a connected "earth" connection.