What is "sound pressure level"

n. the physical intensity of sound [syn: acoustic power]

Sound Pressure Level the first album by the noise group MAZK. It comes in a clear jewel case with no artwork, beneath the CD is a paper insert in the same shape. The artist and title are written as "MAZK SPL" on the disc and "Masami Akita & Zbigniew Karkowski – Sound Pressure Level" on the insert.