The harsh distortion that happens when a signal exceeds the maximum level a system can handle.
Clipping occurs when a signal is pushed past its ceiling, so the tops of the waveform are squared off. It sounds harsh and crunchy and can damage speakers at high volume.
Why it matters
Clipping is the most common way a DJ set sounds bad through a big system. Watching levels and leaving headroom keeps the sound clean and protects the rig.

