The Crown® TP-170V is a rack-mountable panel with four autoformers to
provide impedance matching between amplifier outputs and constant voltage
loudspeakers. This unit allows amplifiers without direct 70V or 100V
output capability to drive distributed speaker systems designed to operate
at those voltages. The TP-170V is constructed of sturdy steel, and hinged
on one side to allow easy access to the inside connections.