The TSD-PA10VG is a cost effective mono amplifier for 4 ohms and distributed constant voltage speaker systems.Applications such as house of worship cry rooms, restrooms, and foyers will benefit from this compact reliable amplifier.The TSD-PA10VG is also a good alternative for small projector systems as it can be used with as many as (8) 25/70/100V ceiling speakers (tapped at 1W each), plus the extremely small footprint allows for easy mounting.For sound masking applications the TSD-PA10VG has the capacity to drive up to 17 masking speakers tapped at .5W each on a 70.7V line.Output is gain controlled from a potentiometer on the front panel with removable knob to facilitate installation of a tamper resistant cover (included).