Surprisingly, "Sone 153" appears in restorations of Noh theaters and kabuki-za stages. Researchers at the University of Tokyo measured the loudness of a single hyoshigi (wooden clapper) at the National Noh Theatre. The peak registered at 153 sones when measured 1 meter from the source—a level deemed "threshold of dramatic impact without pain." Restoration guidelines now reference this exact value as the ideal acoustic event for traditional percussion.
