Has anyone modified their amp to be compatible with 110V AC? This amp is supposed to take 220V AC. However, I can spy inside and see there is some printing on the PCB which has different options: 110V 120V 220V 240V. I realize I can just use a voltage converter, and that my warranty would be voided by modification. Just would be nice if there was a simple mod that could allow me to avoid using the voltage converter. I am going to open it up and look closer, but it requires an Allen wrench size I don't have (yet). I may just be antsy because I just got the amp, but the converter is still in the mail.