B.

Class [009]
Professional installed audio and video equipment, namely, audio amplifiers, audio mixers, sound filters, equalizers, encoders, audio decoders, video decoders, microphones, microphone arrays; gain and noise control units, namely, electronic and microprocessor controllers for audio equipment; analog and digital equipment used to capture, amplify, modify, combine, process and transport audio and video signals, namely, amplifiers, digital audio signal processors, audio mixers, microphones; network based paging and background music system with life safety and mission critical paging capabilities, comprising computer hardware and downloadable operating software therefor, all of the foregoing for use in multi-component, compatible system installations; none of the foregoing includes headphones or earphones or audio hardware or software for headphones or earphones, or downloadable music.