Adjust Input Level knob until Output Clip LED illuminates to appropriate color. Be sure to disconnect PLC2 Punch Level Control (if equipped) from amplifier. Oscilloscope photos show output clip feature configured to a clean signal (0% THD), the threshold of clipping (1% THD), and full clipping 5% THD) using 1kHz 0dB. This establishes your maximum source unit volume for adjusting the Output Clip Indicator. Decrease source unit volume slightly until LED turns off. NOTE: Input Clip can be viewed remotely with optional PLC2. Increase source unit volume until Input Clip Indicator illuminates red. Be sure x-over is set to appropriate setting. NOTE: Use 40Hz 0dB (Track 5) for subwoofer amplifiers or 1kHz 0dB (Track 7) for full-range amplifiers. Insert test tone or music CD to play for setup. Adjust Bass & Treble levels on the source unit to flat. Turn on the source unit and set volume to zero. Disconnect all speakers from the amplifier. Using CLEAN, you can precisly set-up your input and output levels to eliminate clipping, which can ultimately cause speaker damage and/or failure. An input LED indicator helps match your source unit to the amplifier by identifing signal clipping from the audio source, while another LED monitors the output level to detect clipping sent to speakers. Rockford Fosgate's new integrated level setting technology called CLEAN (Clipping Calibrated Level Eliminates Audible Noise) is a simple LED indicator system designed to help eliminate speaker damage.
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