The city of Pompeii (Italy) was buried by lava from the eruption of the volcano Vesuvio in 79 AD. The Large Theater of Pompeii was brought to light in recent centuries; in origin it could accommodate about 5.000 spectators, now it has been partly rebuilt, and is used for various kinds of show performances. Last year, the cavea, in the past covered with grass has been covered with bricks. This paper reports the acoustic evolution of the Large Theatre of Pompeii. Starting with a virtual reconstruction of the theatre in it’s origin, the acoustic characteristics were evaluated using “Odeon” room acoustic software. Subsequently are reported the acoustic characteristics of the theatre after the reconstruction of the cavea with bricks.