Check the listing for details. JL AUDIO CL441DSP CLEAN SWEEP OEM AUDIO INTERFACE W/ AUTOMATIC DIGITAL E Q. Condition: New. Listed at 79.00 USD. This is a JL Audio CleanSweep CL-SES Source Expander Switch, featuring a blue box with the JL Audio logo.It is designed to be used with the CL441dsp CleanSweep signal processor to add extra auxiliary inputs to a car audio system.The switch allows users to select from up to three input devices using either automatic signal sensing or a manual switch.This device helps integrate aftermarket audio sources without resorting to FM modulators or cassette adapters.