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This revolutionary line output converter automatically detects the frequency range of your speaker leads and a whole lot more! News flash: factory audio systems dont always deliver a full-range signal on every speaker wire. That makes it tough to hook up an aftermarket amp and get the sound you wanted C until now. Attach the speaker wire to the KEYLOC play a free test tone below and read the LEDs. Youll instantly know if Hi Mid or Lo is coming from a particular pair of speaker wires. No oscilloscope or RTA needed! Using KICKERs FIT 2+ technology the KEYLOC has the most versatile input sensitivity in the car-audio aftermarket. Ranging from 125 mV C 10V Lo or 1V to 40V Hi the KEYLOC is prepared to work with nearly every vehicle on the road today. The KEYLOC allows you to keep or defeat factory time delay or the all-pass filter built into many modern vehicles. By defeating this filter the KEYLOC instantly counteracts the either of these factory effects allowing you to tune for one-seat audio or maintain the factory imaging.