Here in Chile, we have 220 V 50 Hz single phase coming from the electrical grid in most residential houses. Due to my buying habits, I have some devices that have been imported from 100-120 V countries. For example, I have a Japanese PS1 that runs at 100 V/50-60 Hz and subwoofer from Amazon that runs at 110 V/50-60 Hz and a bunch of others.
What would be the most efficient way to get ~110 V 50 Hz?
The reason why I want something efficient is because all of the devices are on the same area (subwoofer is under my desk, PS1 is to the left of my desk under my TV, etc.) and I don't want to have one step down transformer per device.