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Reverb Time
The Reverb Time section includes these 4 parameters:
C
ONVOLUTION START: Range: 0 TO 1 second; Default: 0 seconds
The Convolution Start control determines the starting point of the convolution process.
It enables you to remove unwanted pre-delay at the beginning of an IR.
C
ONVOLUTION LENGTH: Range: 0 seconds to 6 seconds; Default: Full
This control sets the length of the process filter. By default it is set to Full, which means
that the IR-series will convolve the input with the whole Impulse Response. However, if
the IR is longer than 6 seconds then it will be cut to 6 seconds. This will be indicated in
the IR Properties display. You can also set the Convolution length manually to be
shorter than the RT60 Reverb time in order to save some CPU. This makes the
Impulse Response stop at some point down the slope, creating a “gated” reverb sound.
This gating effect can be avoided by using the Envelope to make the IR fade out
earlier. The default Full setting will only use the amount of CPU it needs for the loaded
IR, so there’s nothing to gain by manually setting it to 2 seconds for a 2 second IR.
R
ATIO: Range: .25 to 4.00; Default: 1.00
The Reverb Time Fader controls the Reverb Time Ratio. The resulting reverb time will
be the original RT60 multiplied by the ratio.
RT60: (Reverb Time, 60dB) is defined as the time it takes the sound pressure level of a
sound to drop by 60dB in gain once the source has been shut off. It is actually a slope
factor. RT60 is a term that is commonly used in building construction and architecture
to describe a room’s acoustic properties.
This field shows the reverb’s current RT60. It is the original RT60 multiplied by the
Reverb Time Ratio. To determine what the original RT60 is, set the Ratio to 1.00. The
original RT60 is calculated by analysis of the loaded IR.
Waves IR-1 software guide page 21 of 40