Originally Posted by jpmiddleton
Your sound system should work no problem, not so sure about the Wii.
Without knowing the make/model this is a very dangerous statement to make !! Most audio equipment use standard step down trafos as opposed to switch-mode supplies. The latter can take a range of voltages and are used in most modern TVs and computers. Standard step down trafos are made/wired for a specific input voltage and, as they are an inductive device, frequency. Some may have a 110/220 switch on the rear near the supply cable entry point but most won't.
OP check the rating plate or user manual for the supply requirements for your audio equipment or any electrical devices you bring from the US before plugging it in here on our 230VAC 50Hz system.