EQ on the fly and with precision in the comfort of your vehicle! The Autotek ATEQ processor features in-dash installation for quick control of master and sub volume. With ATEQ, equalization adjustments for real-time tuning have never been easier. Features: Half-DIN, 4-Band Preamp EQ With Front/Rear Active Crossover Features Line Driver Circuit Delivers 9 Volts Of Preamp Level Signal Through The RCAs Audio Input Selector For Switching Between Head Unit And Another Audio Source Input Level Controls For Both The Car Radio And Any Media Device To Ensure Identical Volume Levels Master Volume Control Of The SPL-Level For Both Sound Sources Front To Rear Dual-Amp Fader 2 Audio Inputs With Level Matching Selectable 12 dB High-Pass Crossover And Low-Pass Sub Output Selectable For Mono Or Stereo Subwoofer Setups 45 Hz Sub-Bass Control 120 Hz Mid-Bass Control