A sophisticated version with wattage tappings selectable by an integral rotary switch on rear for selections of 70 Volt,100 Volt and 8 Ohm

Two-way sound system by adopting polypropylene woofer driver and silk dome tweeter are used

Built-in step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables,are most appropriate for high-voltage audio distribution systems.