AmpPRO simplifies the installation of upgraded amplifiers in select amplified sound systems. With AmpPRO, you can improve the audio performance while keeping the original radios fit, finish and features. Benefits Simplifies amplifier installation Prevents the need for summing and DSP devices Provides factory sound system upgrade solution Features Upgrade the entire sound system or just part of it thanks to the retention of the original amplifier Variable volume, balance, bass, mid and treble audio settings Front, rear, sub preamp outputs (5 volt RMS) Customized OE bass, mid and treble center frequency selection Retains Bluetooth audio, Navigation prompts, and all warning chimes Plug-and Play installation Sublevel controller included Optional TOSLINK optical output (APA-TOS1 sold separately) Includes AmpPRO module Harness Bass knob Knob harness Manual