That is the point, the equipment in the video wasn't that of a professional. It was mostly cheap, run of the mill, hobbyist grade stuff. Again, great stuff for troubleshooting, but not for trying to give accurate certification of claimed specifications. This kind of why most "clamp" tests are out the window. And, for the record, the equipment is out there to do proper testing, it just costs a lot more and isn't really justified for 99% of us... Who knows, that amp might make less power with the proper test equipment, but it is irrelevant... But this is falling on deaf ears, so I won't try and get you to understand this anymore.