I think its "legendary" amping requirements are blown out of proportion; very akin to broscience on bodybuilding forums.
Why does it need so much voltage given its low impedance? Also, voltage and current are intimately related via resistance. Providing a good amount of either through an amp will translate to power.
in the case of MOSFET amps, i think the K702 do sound much better with a higher current bias which inherently equals more power. do they need they need a lot of power to attain adequate volume without clipping - no.