Acoustics of the Chelys – An ancient Greek tortoise-shell lyre

The acoustics of an authentically reconstructed ancient Greek tortoise-shell lyre, known as Chelys, is investigated for the first time. Modern experimental methods are employed, such as electronic speckle pattern laser interferometry and impulse response, to extract the vibrational behavior of the instrument and its main parts. Additionally, the emitted sound from the instrument was recorded, under controlled conditions, and spectrally analyzed. Major findings include the concentration of the emitted sound between 400 Hz and 800 Hz, with an amplitude modified in a manner consistent with the experimentally measured vibrational characteristics of the instrument’s sound box and bridge. The experimental results validate the historical evidence that Chelys was used in Greek antiquity as an accompaniment instrument to the human voice.