Classic Series are public address mixer amplifiers that provide mixing of microphones, telephone, and auxiliary sources. Output screw terminals are provided for 4-ohm (direct) and 8-ohm, 16-ohm, 25V and 70V (transformer-coupled) speaker systems. Output jacks let you connect to a tape recorder or an additional booster amplifier, or feed a 600-ohm telephone line when an accessory transformer (Model WMT1A) is used.