The High End parameter provides precise control over the reverberation characteristics of high frequencies. With nine different settings/multipliers, ranging from 0.10 to 2.50, including a linear (LIN/x1) setting, users can adjust the high-frequency reverb time to either match or deviate from the overall reverb time.
This parameter is especially crucial for managing the decay of higher-pitched sounds within a mix. For sounds around 1 kHz (approximately C6), natural reverberation tends to diminish relatively quickly. However, for even higher pitches, such as those around 8 kHz (close to B8), the High End control allows for the adjustment of their decay rate.
Unlike the Low End control, which focuses on the depth of bass frequencies, the High End parameter essentially 'tunes' the volume of the echoes for these higher frequencies. It offers the flexibility to either prolong or shorten the echo, akin to adjusting the reflectivity of the walls in a virtual room for these high-pitched sounds.
It's important to note that in natural acoustics, higher frequencies have inherently shorter reverberation times. For example, a sound at 5 kHz (approximately D#8) could naturally echo for about 3 seconds in any room, and a sound at 10 kHz (approximately D#9) will have a maximum echo duration of only about 1.2 seconds.
Therefore, when setting the High End parameter, opting for shorter settings can often yield more realistic results, particularly if a longer overall reverb time is desired. This approach aligns with the natural behavior of sound in real-world spaces, where higher pitches dissipate more quickly than lower ones.