Bump. I notice the PR500 and Hifonics BXI 610 (500 and 600 watts RMS respectively) both have 60a fuses, while my Kenwood (500 watts RMS) has a 40a fuse. With a 40a fuse, they Kenwood would be physically impossible of putting out 500w RMS at 12.4 volts, even if it were 100% efficient (which it's...