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The TSD-PA10VG is a cost effective mono amplifier for 4Ω 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). Unit requires an external Power Supply that is sold separately for proper function, multiple TSDs can be powered with one power supply based on current requirements. This unit has a power requirement of 500mA so you must use the TSD-PS24V500MA or TSD24V2500MA power supply. For multiple TSD applications use the TSD Power Calculator to determine the proper power supply needed.