I believe it is Dennis Fraker of Serious Stereo who also dotes upon the 'correctness' of that 57 1/4" length (or multiples/divisions thereof). I myself can neither confirm nor deny.
Who remembers the FULTON cables?
Back when I was a teen starting in this hobby, I remember that there was speaker cable by FULTON that was so thick, people referred to it as "welding" cable. Does anyone know what it sounded like? I would think rolled off with powerful bass. Perhaps diameter-wise, some of today's cable is even thicker.