Sceptre 6 and Sceptre 8 monitors are setup to be voltage specific for the region they are meant for. They are sold as different models that supports 100-120VAC 50Hz / 60hz and another that is 220-240VAC 50Hz. In the event that you receive the incorrect voltage setting, there is an internal modification that needs to be performed in order to switch Sceptres from 110VAC to 220VAC. This modification must be performed by a registered PreSonus distributor and would not be covered under product warranty.
You can find the voltage rating just above the IEC Power connection on the back of the Sceptre speaker.