Classis Series Public Address Amplifiers. 3 models: 35, 60, and 100 watts. 4 inputs: 1 MIC (Lo-Z), 1 AUX (Hi-Z), 1 TEL, plus 1 selectable MIC or AUX. Each input controlled by an independent volume control. Treble and bass controls. AUX muting by external contact closure for push-to-talk microphones. TEL input for telephone paging applications. TEL input voice-activated (VOX) mute over AUX input. Variable threshold for TEL input voiceactivated AUX mute. Outputs for 4-ohm (direct), 8-ohm (C35 & C60 models only), and 16-ohm, 25V and 70V speaker systems (transformer coupled). Output jack to connect a recording device or booster amplifier. Output jack to connect a general-purpose 600-ohm matching transformer (model WMT1A). Thermal protection and electronic shutdown. Rack mountable with accessory mounting kit (model RPK50). Listed to UL Standard 60065 for U.S. and Canada.