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Most factory stereos, even high-end systems, protect speakers by reducing subharmonic output when the volume is high. That's okay in a regular system, but this bottle neck system will handicap low-frequency performance if you want to upgrade your factory stereo with amplifiers and subwoofers. The Earthquake Sound MB1 detects the input level from a factory stereo, then adds more bass at high volume levels while keeping your bass response balanced at low volume. Now you can keep your factory stereo looking flush and its steering wheel controls intact while actually improving the bass quality and depth. The MB1 wires up to any system easily, and can be mounted in the front or rear of the vehicle. It has two gold plated inputs and outputs plus it has a remote dash control for easy adjustments. The WIDE knob adjusts how wide of a frequency range the MB1 will affect. The SWEEP knob allows you to pick the center frequency (between 27Hz and 63Hz) that you want the MB1's restoration circuit to maximize.