Not to beat a dead horse, but my mtx amps all had a "battery" and a "capacitor" power and ground input, yet both were bridged to one block for each. So really you could do whatever you want.. Just how they choose to describe it.. If you don't believe it, connect the power and ground of the cap input and see if theres not a tad bit of current in there for you.. As far as the testing goes, its likely both of the testers left out some variables which could've explained how the 4 ohm and 1 ohm actual load testing were so close in output.