Every house has 240 volts which you can use through a 240 volt breaker and wiring the outlet as 240 volts. However, most of the circuits in a house will be 120 volts because the breaker panel is split into two, 120 volt legs. I have four 240 volt outlets in my house. One in the kitchen for the oven, one in the laundry room for a dryer, and two in my workshop for welders and other 240 volt tools. If you want to run you equipment on 240 volts, have an electrician put in the correct wiring and an outlet.
100v,115v versus 230v
Some audio technicians/ enthusiasts claiming that, high end audio equipment performs much better european 220/230v even 240 UK voltage if that's the case why USA 110V / 120 volt AC ?