diapason

rekisteri the range or scope of something, especially of notes in a scale, or of a particular musical instrument

1934: the piano curving like a conch, corollas giving out diapasons of light — Henry Miller, Tropic of Cancer

1961: he could hear nothing except the rattle of the crickets and the swelling diapason of the frogs — Graham Greene, A Burnt-Out Case

1818: 2 to 1, which is a duple ratio, forms the symphony diapason — Iamblichus, https://books.google.com/books?id=J_BZAAAAcAAJ Life of Pythagoras Tr. w:Thomas Taylor (neoplatonist)|Thomas Taylor (page 328)