Abstract
The Cumaean Sibyl cave is a place in the north of Naples, Italy. The Sibyl was a priestess presiding over the Apollonian oracle; she received the travelers to whom she predicted their future. The cave is length about 140 m, with trapezoidal section excavated in the rock of tuff; the height is about 4.5 m and large about 2.4 m. There is a little room, in the final part of the cave, where according to the legend, the Sibyl received the travelers. The acoustic measurements were done with an omnidirectional sound source in the in the little room and the microphones along the cave. The software for architectural acoustic were used to better understand the sound propagation in the cave. From acoustic measurements and numerical results it emerges that the voice emitted by an orator positioned in the room inside the Sybil cave, is understood in every tunnel point. This paper shows that the legend that this site was an oracle has true acoustical basis.
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