I don't think it takes a crazy expensive rig to hear differences in cables. They're very minor though regardless of the system. I just don't like the liars who tell some nube they hear the direction of their fuse. No, you don't. We'd all laugh at the guy who burns sage to ward off the demons that curse his amp, but it's not ok to laugh at the guy who's placing the same faith in similar hocus pocus like fuses or blue dots or rocks that work for the same reason; it plays on a fertile imagination.
People making bold statements of fact like these clowns do is the reason we invented science and measurements.