His Spec 4 meters are peak reading and he's playing music, interpreting the +3dB meter ballistics swing as being 'real' watts. A Spec 4 barely hits 180w/ch both channels driven in a tailwind. Even that would vaporise the Sansuis. 90 watts continuous sine wave would take them out, but then again, 90 watts continuous dissipation is an awful lot for any vintage speaker long term. Peaks, sure, but hour after hour- no way.