The Crown Audio T-170V Constant Voltage Transformer provides impedance matching between the output of an amplifier and "constant voltage" loudspeakers. Amplifiers that do not have direct 70 V or 100 V output can now drive distributed speaker systems that operate at those voltages. When used with the CTs 600, 1200, 4200, and 8200 amplifiers in dual mode the T-170V provides 100 V output.