User Guide

Issue 4, December 2020 Model 780-01/790 User Guide
Page 20 Studio Technologies, Inc.
for Surround
will show negative values, reaching –70.0
before the full mute function automatically
mutes the post-fader monitor outputs.
In the SPL mode the display can be con-
figured to allow the output level to be
presented to users in terms of an actual
sound pressure level (SPL). It is used in
conjunction with the reference level in dB
SPL configuration and the stored reference
level. The SPL mode allows a user to see
a visual representation of the SPL level
that is present in the listening environment.
While it takes a little more care to correctly
implement the SPL display mode, it can
offer an enhanced experience for Studio-
Comm users.
Reference Level in dB SPL
The reference level in dB SPL configu-
ration allows a specific SPL value to be
associated with the stored reference level
value. In this way whenever the post-fader
monitor outputs are at their reference level,
either through activating the reference lev-
el function or manually adjusting the rotary
level control, the Model 790’s display will
show the configured SPL level. Whenever
the post-fader monitor output is not at the
reference value the display will show the
current value, in dB, relative to the refer-
ence level. The reference level in dB SPL
can be configured over a range of 70.0 to
100.0 dB in 1.0-dB steps. In many applica-
tions using the default value of 85 would
be appropriate, reflecting the widely used
audio-for-picture 85 dB monitoring refer-
ence level. (Typically this 85 dB is really
85 dBC, indicating that a C-weighting filter
has been applied to the measurement.)
Other common reference SPL values,
such as 82 dB and 87 dB, are well within
the allowable range.
Auto Reference Level Off
When auto reference level off is enabled,
the function automatically turns the refer-
ence level function off if a change is made
to the rotary level control while the refer-
ence level function is active. This is pro-
vided strictly as a user convenience that
may, or may not, be desired. The default
configuration is for the auto reference level
off function to be disabled.
Dim Level
The dim function is used to reduce the
post-fader monitor output levels by a pre-
set amount. The reduction is in dB relative
to the post-fader monitor outputs’ current
level. There are four dim level values avail-
able: 10, 15, 20, and 25 dB. The default
value is 20 dB.
Remote Mute All
Two configuration choices are associated
with the remote mute all function: disabled
and enabled. The default setting has the
function enabled.
Remote Dim
Two configuration choices are associated
with the remote dim function: disabled and
enabled. The default setting has the func-
tion enabled.
LFE Downmix Level
By default, when the To Stereo or the To
Mono downmix functions are active the
LFE channel associated with the selected
surround input is fully attenuated (muted).
This removes LFE content from the “down-
mixed” signal. In most applications this is
appropriate. However, for special situa-
tions a configuration mode allows the LFE
channel to be included. In this scenario,