TSD-PA20VG20W Mono 25V/70.7V/100V Power Amplifier by Atlas Sound is a is a cost effective mono amplifier for 4 and distributed constant voltage speaker systems.
It is best to use in hallways and classrooms. The TSD-PA20VG is also a cost effective alternative for small projector systems as it can be used with as many as (16) 25/70/100V ceiling speakers (tapped at 1W each), plus the extremely small footprint allows for easy mounting.
It features a Removable Level Control with Set-It-And-Forget-It Security Cover and Output is gain controlled from a potentiometer on the front panel with removable knob.