Alpine's KTX-CSP1 microphone plugs into your PXE-C80-88 DSP/amplifier and provides the PC-based tuning control app with the high-qualiy audio signal necessary for the Optim™8 processor to produce accurate and high-fidelity sound adjustments automatically. The included 10-foot proprietary cable provides balanced signal and power for the mic, and lets you move the mic to different locations when tuning your system. With the proper adapters, the mic can also work as a standardized sound-measuring device for almost any audio application. Warranty: 1 year.