The Crown 135MA is a high value mixer-amplifier for commercial audio. It provides 8-ohm and constant-voltage outputs 70V and 100V. Typical uses are paging, background music, and music-on-hold. The 135MA provides 3 inputs each with a volume control and a 35 Watt amplifier output. Other features include priority muting, voice activated muting, phantom power, and Bass and Treble controls.