If I were to use lets say a 200-400 watt amplifier bought from the US which has a rating of 120 (+/- 3%) Volt AC Line, would it be better for me to use the 110v socket of my Samwon AVR or is it better to buy an independent ( step-up or step-down ? ) transformer ?
if so what's a good quality transformer and where can i buy it besides true-value or ace