Studio Technologies 76D 2014 - Manual (Page 18)

Issue 11, May 2014 Model 76D/77 User Guide
Page 18 Studio Technologies, Inc.
for Surround
Model 77 units. Be sure that any selected
address does not conflict with addresses
to be assigned to Model 71 units.
Stereo Input C Sample Rate
Converter
Circuitry associated with stereo input C
can provide sample rate conversion (SRC)
for digital audio signals connected to
that input. The acceptable input range for
sample rate conversion is very wide, but
is dependent upon the output sample rate.
With an output sample rate of 48 kHz any
signal with a sample rate over a range of
8 to 216 kHz can be properly monitored
by the system. This capability can be
especially useful with signals that are not
synchronized with respect to the others
connected to the Model 76D, even if the
sample rate is identical. The only compro-
mise is that the SRC process adds a fixed
input-to-output (group) delay of approxi-
mately 1 millisecond, a value that shouldn’t
impact most installations. As such, it’s rec-
ommended that the sample rate converter
remain enabled. However there might be
special cases where this resource isn’t
desired and it can be disabled.
Post-Fader Stereo Monitor
Output
In addition to the post-fader surround
monitor output, a separate post-fader
stereo monitor output is also provided. By
default the stereo output can be enabled
by an operator. In applications where ste-
reo monitor loudspeakers are not connect-
ed to the post-fader stereo monitor output,
the output can be disabled. This can mini-
mize confusion, preventing an operator
from attempting to select the post-fader
stereo monitor output.
Bass Management
The Model 76D incorporates flexible and
sonically excellent bass management capa-
bilities. It is, however, limited to functioning
only at sample rates of 44.1, 48, 88.2, and
96 kHz. Five configuration parameters are
used to enable or disable bass manage-
ment as well as to select the characteristics
of the associated audio filters. While the set-
tings are simple to make, great care must
be taken in first reviewing the entire monitor
system. Only after a full understanding of
the performance of the associated surround
and, if present, stereo loudspeaker systems
are determined can a plan for bass man-
agement be established.
Bass management can be enabled so that
the function is active when the surround
post-fader monitor outputs are enabled. It
can also be independently enabled so that
it can be active when the stereo post-fader
monitor outputs are enabled. By default
bass management for both outputs is dis-
abled. The crossover point of the bass
management filters can be selected from
among four choices: 40, 50, 60, or 80 Hz.
The slope of the low-pass and high-pass fil-
ters associated with bass management can
be independently selected. The choices are
12 dB/octave or 24 dB/octave with the latter
being the default.
Mute/Solo Bass Management
Mode
The Model 76D’s mute/solo function can be
configured for how it performs in applica-
tions where bass management has been
enabled. This is a somewhat-esoteric topic
but can be important in certain situations.
The default setting for the mute/solo bass
management mode is for pre-bass man-
agement. This means that if a channel has