Not needed when running a Navatlas source unit, NA82M, NA30C, NA1BT and NA2BT.

The is a must add on when running an Aftermarket radio, most Aftermarket radio do not have the correct RCA voltages, they run between 1.5-2 Volts to cut costs. All Navatlas Amplified speakers and amplifier require 4.5 volts to perform at their maximum performance level. The LB5V is adjustable to up to 5 Volts. The higher the voltage the louder the Amplifier get.