These are not switchable to 220v (It requires a different power supply- which is not available to us)

None of the Mackie products with internal power supplies are switchable!!!

To use Mackie amplifiers at overseas operating voltages the internal tranformer has to be replaced..It CANNOT be switched to work at a different voltage, and the end user should replace it with a transformer purchased in the country where it will be used, or just buy a switchable step up transformer if they are going to be travelling extensively..