Acoustical specif. (Italian Law)
lExternal walls   R’w = 42 dB
lInternal walls   R’w = 50 dB
lFire-resistant walls R’w = 50 dB
lWall between cinema rooms  R’w = 50 dB
lRoof  R’w = 42 dB
lFloor R’w = 50 dB
lInternal doors    ---
lWall of the projection room ---
Apparent Sound Reduction Index
(ISO-140/4, ISO-717)