John Marks brought violinist Arturo Delmoni to Axpona New York, who in turn brought his 18th-century Guadagnini—and his virtually unique mastery of the Romantic approach to solo violin. His Friday afternoon performance of the Ciaconna from Bach’s D-minor Partita held the audience spellbound, with extraordinary intonation, oceans of tone, and a passionate, emotional one-ness with Bach’s music that prompted JA to comment, appropriately: “The man was on fire.”

JA was sitting at the back of the ballroom and was surprised by how loud the sound of the solo violin was. Whipping out his iPhone with the Studio Six Digital SPL Meter app, he measured the typical sound pressure level at 72dB(C).