K-AMP circuit (TILL) – causes the Treble to Increase at Low Levels and to decrease at high levels. Name after its inventor, Dr. Mead Killion, this circuit is designed to amplify more in quite environments and less in loud environments. It was designed for people who need amplification for soft sounds but who hear loud sounds normally. The K-AMP circuit regulates the volume automatically and does not amplify loud sounds.
kneepoint – also called compression threshold. It is the point, in sound decibels, that a compression circuit begins to reduce the gain. Some circuits allow this point to be digitally programmed, being customized to the user’s need.