“In many acoustical applications, sound is considered as falling in eight octave bands, with center frequencies of 63; 125; 250; 500; 1,000; 2,000; 4,000; and 8,000 Hz. In some cases, sound is considered in terms of 1/3-octave bands, with center frequencies falling at 31.5; 50; 63; 80; 100; 125; 160; 200; 250; 315; 400; 500; 630; 800; 1,000; 1,250; 1,600; 2,000; 2,500; 3,150; 4,000; 5,000; 6,300; 8,000; and 10,000 Hz.”