The Acoustilyzer AL1 is the predecessor of the XL2 Audio and Acoustic Analyzer. It is a handheld sound level meter and acoustic analyzer for measuring and monitoring sound pressure level, room acoustics and, optionally, speech intelligibility STIPA. Additionally it offers basic audio measurements. These acoustic and audio functions make the Acoustilyzer AL1 the ideal tool for measurement applications in Installations, Live Sound, Studio and Broadcast. The AL1 requires the optional measurement microphone MiniSPL for acquiring acoustical signals.