Today's modern vehicle audio systems are becoming increasingly more sophisticated and complex. PAC engineered AmpPRO to dramatically simplify the installation of upgraded amplifiers in data-bus-controlled amplified sound systems. AmpPRO allows you to keep the original radio's fit, finish, and features while giving you the freedom to improve the audio performance in record time! UPC: 609098826112 BENEFITS: Simplifies amplifier installation Prevents the need for summing and DSP devices Provides factory sound system upgrade solution FEATURES: It can be used to upgrade the entire sound system or just part of it thanks to the retention of the original amplifier Enables the addition of a subwoofer system to the original sound system Upgrade solution for factory, fixed level, data-bus controlled sound systems Everything you need in one box to install your choice of aftermarket amplifier(s) The time-saving design prevents the need for summing and audio correction devices. Variable volume, fade, balance, bass, mid, and treble audio settings Retains Bluetooth, navigation, safety system, and all warning chimes Front, rear, sub preamp outputs (5 volt RMS) Provides flat audio output for a solid audio foundation Customized OE bass, mid, and treble center frequency selection Plug-n-play installation with two 20-pin connectors (IE Bus) Remote sub level controller included Optional TOSLINK optical output (APA-TOS1 sold separately) INCLUDES: AmpPRO module Harness (IE Bus) Bass knob Knob harness Manual HOW IT WORKS: