Oudtshoorn DRC Hum Prime Tierce Quint Nominal Superquint Double Octave Diameter Height Thickness Freq Note Dev Freq Note Dev Freq Note Dev Freq Note Dev Freq Note Dev Freq Note Dev Freq Note Dev 68 51 5.6 341.5 F1 -38 661 E2 4 821.5 Ab2 -19 992.5 B2 8 1352.5 E3 44 1989 B3 11