TC amplifiers are built for listeners who want their music to be pure and loud. On-board crossovers and EQs let you customize your sound while the Smart Engage™ Circuitry lets you install TC amps without ripping out your factory system. Thunder TC amps are all about solid MTX power and should only be used when you want to rattle the windows of the vehicles rolling along side you. Keep Your Stock Radio, Navigation, and Steering Wheel Controls Patented Smart Engage™ Circuitry and both High and Low Level Inputs - eliminates the need to remove the head unit during most factory integration installs without external adapters, devices, or converters. Listen to Your FM Radio or iPod FM Modulator Without Static From Your Amps Adaptive Class D Technology - Class D amplifiers send out FM interference adding static to your radio signal. MTX Audio's Adaptive Class D Technology gives you more power and less audible interference so you only hear your music. Minimize