Hi to all: our standard electrical outlets in the US is 110, I have a denon 1912 avr which gives out 110 to 240 volts which 99.9% I listen to music, my current setup is 2.0, adding a sub which I haven't decided on yet, my budget is $500. denon 1912 avr. 2 svs prime tower speakers. yamaha cd-c600bl 5 disc Do I need a voltage converter...Thanks To ALL