I called Grace and they recommend using there power supply. For my 6V, it's a 7.5/1.0A. I'm not sure if RS would have that, but Grace's comes with the right plug on the other end(screw on). They didn't say anything about DC being a better power supply, but I'm just using this to run the V3 with phantom on for cable burn in and some local shows were I have access to ac power. thanks.