Don't just make your system louder - make it clearer. Make it better Press the selector, and the microphone goes to work. The KEY uses a powerful internal computer to deliver dramatic improvements in realism and soundstage. A massive 40-band equalizer improves tonality. A 24dB crossover re-defines the capabilities of each speaker. Time alignment delivers unheard realism. The concert quality of your factory stereo is revealed! What would take hours for a professional to achieve happens in a matter of minutes. All automatically. All with the press of a single button. Start with these free test tones for easy setup!