Our two channel contractor series mixer/amplifier is a 15 watt amplifier. It features an auto mute function, music on hold output with separate level control (600 ohm line and one watt 8 ohm), 600 ohm telephone line input with level control, bass/treble tone controls, front panel level controls, bass and treble tone controls, front panel level controls, and manual muting contacts.<br><br>In addition to the telephone line input, this unit accepts inputs from two sound sources. Each source utilizes a microphone input (terminal strip). Source 1 also offers the option of an auto summing stereo auxiliary RCA input.<br><br>Outputs include a choice of 4, 8, and 16 ohm as well as 70 and 25 volt line outputs. Rack (PBM-RK1) and wall (PBM-WK1) mounting kits are available (not included).