Boulder Amplifiers 860 - Manual (Page 12)

2-2
CLIP DETECTION
Clipping of the waveform results when any amplifier is driven at too
high a level. A clip detection circuit is included in the 860 Stereo Power
Amplifier.
The indicator will indicate clipping by momentarily turning from
amber to red. Both voltage and current modes of clipping will be
detected, although generally it is only voltage clipping which occurs.
OPERATION