Specifications

DigiRack Plug-ins Guide60
20-bit Recommended for output to digital de-
vices that support a full 20-bit recording data
path, such the Sony PCM-9000 optical master-
ing recorder, or the Alesis ADAT XT 20. Use this
setting for output to analog devices if you are us-
ing a 20-bit audio interface, such as the
882|20 I/O audio interface. The 20-bit setting
can also be used for output to digital effects de-
vices that support 20-bit input and output, since
it provides for a lower noise floor and greater dy-
namic range when mixing 20-bit signals directly
into the TDM environment.
Noise Shaping
Noise shaping can further improve audio perfor-
mance and reduce perceived noise inherent in
dithered audio. Noise shaping uses filtering to
shift noise away from frequencies in the middle
of the audio spectrum (around 4 kHz), where
the human ear is most sensitive.
The Noise Shaping button engages or disengages
Noise shaping. Noise shaping is on when the
button is highlighted in blue.
POW-r Dither
(Pro Tools HD and Pro Tools LE Only)
The POW-r Dither plug-in is an advanced type
of dither that provides optimized bit depth re-
duction. It is designed for final-stage critical
mixdown and mastering tasks where the highest
possible fidelity is desired when reducing bit
depth. For more information on dithering, see
“Dither” on page 59.
POW-r Dither Controls
Bit Resolution
Use this pop-up menu to choose either 16- or
20-bit resolutions for POW-r Dither processing.
Set this control to the maximum bit resolution
of your destination.
16-bit Recommended for output to digital de-
vices with a maximum resolution of 16 bits,
such as DAT and CD recorders.
20-bit Recommended for output to devices that
support a full 20-bit recording data path.
The DigiRack Dither plug-in only provides
eight channels of uncorrelated dithering
noise. If DigiRack Dither is used on more
than eight tracks, the dithering noise begins
to repeat and dither performance is im-
paired. For example, if two Quad DigiRack
Dithers are used, both Quad instances of
Dither will have all of their dither noise un-
correlated. However, any additional in-
stances of the Dither plug-in will begin to
repeat the dithering noise.
POW-r Dither plug-in
The POW-r Dither plug-in does not run on
third party applications that use DAE.
The multichannel TDM version of the
POW-r Dither plug-in is not supported at
192 kHz. Use the multi-mono TDM or
RTAS version instead.