... , public safety device, security applications, waterside Long Range Acoustic Device - QS IILong Range Acoustic Device (LRAD) QS II is a ... flat panel, it make up a surface acoustic base array, and use the acoustic supraposition principle to ... degree +/- 5 degreeBeam shapeSymmetry coneDistortion<10% @134dB(rms)CompositionAcoustic base array ,Signal Source, Amplifier, Controller, Power Supply * LRAD, ...