Decay Time; Lf Damping - Kurzweil K2661 Musician’s Reference Manual

Parameters
Page 1
Wet/Dry 0 to 100%wet
Room Size 1.00 to 4.00 m
Pre Dly 0 to 500 ms
HF Damping 16 to 25088 Hz
Page 2
Lowpass 16 to 25088 Hz
Wet/Dry The amount of the stereo reverberator (wet) signal relative to the original input (dry)
signal sent to the output. The dry signal is not affected by the Lowpass or Bass Gain
controls. The wet signal is affected by the Lowpass and Bass Gain controls and by all the
other reverberator controls. The balance between wet and dry signals is an extremely
important factor in achieving a good mix. Emphasizing the wet signal gives the effect of
more reverberation and of greater distance from the source.
Out Gain The overall output level for the reverberation effect and controls the level for both the wet
and dry signal paths.
Room Size Choosing an appropriate room size is very important in getting a good reverberation
effect. For impulsive sources, such as percussion instruments or plucked strings, increase
the size setting until discrete reflections become audible, and then back it off slightly. For
slower, softer music, use the largest size possible. At lower settings, Room Size leads to
coloration, especially if the Decay Time is set too high. To emulate a plate reverb, this
control is typically set to 1.9m.
Pre Dly Introducing predelay creates a gap of silence between the dry sound and the
reverberation, allowing the dry signal to stand out with greater clarity and intelligibility
against the reverberant background. Especially helpful with vocals or classical music.

Decay Time

The reverberation decay time (mid-band "RT60"), the time required before the
reverberation has died away to 60dB below its "running" level. Adjust decay time
according to the tempo and articulation of the music. To emulate a plate reverb, this
control is typically set in the range of 1 to 5 seconds.
HF Damping Adjusts low pass filters in the reverberator so that high frequencies die away more quickly
than mid and low frequencies. This shapes the reverberation for a more natural, more
acoustically accurate sound. To emulate a plate reverb, a typical value is 5920Hz.

LF Damping

Adjusts high pass filters in the reverberator so that low frequencies die away more quickly
than mid and high frequencies. This shapes the reverberation for a more natural, more
acoustically accurate sound. To emulate a plate reverb, this control is typically set to 52
Hz.
Lowpass Shapes the overall reverberation signal's treble content, but does not modify the decay
time. Reduce the treble for a duller, more natural acoustic effect. To emulate a plate reverb,
this control is typically set to 3951Hz.
Bass Gain Shapes the overall reverberation signal's bass content, but does not modify the decay time.
Reduce the bass for a less muddy sound. To emulate a plate reverb, this control is typically
set to -12dB.
Out Gain Off, -79.0 to 24.0 dB
Decay Time 0.2 to 5.0 s
LF Damping 1 to 294 Hz
Bass Gain -15 to 0 dB
KDFX Reference
KDFX Algorithm Specifications
10-23