From page 6 of owner manual:
VS– Mains Voltage Switch (12)VOLTAGE SELECTORThe Penta 5.1 amplifier can be used in allcountries and is good both for 110/115 and220/230 V. Before the first operation, pleasemake sure that Mains Voltage Switch is set tothe value accepted in your country.
rocky 1313 said:
#1. AC 230:S2.5A
#2. AC 110: S5A
I have it set to #2 setting ....AC 110 : S5A .......... Correct for US.