The Kicker KEYLOC is a 2-channel line-out converter with DSP processing that can detect, analyze, and correct the audio from your factory system, when adding aftermarket amplifiers. The KEYLOC's patent-pending KEY algorithm automatically detects and analyzes crossovers, EQ, time delay, and any all-pass filters present. It will then correct these various audio treatments, for the smoothest frequency response possible, and level-matches the left and right audio channels, giving you a clean, uncolored audio signal for your aftermarket amplifiers

• Automatic turn-on: The KEYLOC senses DC offset on the speaker-level inputs, between 2.5V and 6V, to automatically power on. A Remote In wire can be used if the connected headunit features a turn-on output.
• Frequency response correction: Smoothest frequency response on the 2 input channels via EQ correction, with Q's ranging from 0.5 - 10 with up to ±12dB of boost or cut.
• Factory time delay defeat: Ranges from .06mS - 10mS, with .06mS accuracy
• All-pass filter defeat: The KEYLOC can correct up to 3 all-pass filters on one channel. The all-pass filters can even have a Q ranging from 0.5-3.5, as long as they're not interacting with other all-pass filters.
• Passive frequency detection: The KEYLOC's default status is in Passive Frequency Detection mode which can detect what band of frequencies are available on each of the speaker input channels.