Studio Technologies 78 2004 - Manual (Page 17)

Model 78/79 User Guide Issue 5, January 2004
Studio Technologies, Inc. Page 17
for Surround
3. Use the Model 79 Control Console to
select the input source that contains
the desired reference signal source,
e.g., pink noise.
4. Observing the SPL meter, adjust the
Model 79’s rotary level control until
the desired reference output level has
been reached.
5. Being careful not to touch the position
of the rotary level control, enter the
configuration mode by pressing and
holding the configuration button locat-
ed on the Model 79’s back panel.
6. Once the configuration mode has been
entered, the monitor outputs will mute.
Press and hold the reference button
until its associated LED lights. This will
take approximately 5 seconds. The
LED will light to indicate that a “snap-
shot” of the new reference level has
been taken. The level display will show
the exact reference level that is being
stored.
7. To store the new reference level in
memory, exit the configuration mode
by again pressing and holding the
configure button.
This level is now permanently stored as
the reference level. Only by repeating the
procedure can the value be changed.
Once the configuration mode has been
exited, the monitor output channels will
again become active. Confirm that the cor-
rect level has been stored by pressing the
reference button. The SPL meter should
again display the desired level. If not,
repeat the calibration procedure.
You might wonder why you have to press
and hold the reference button for 5 sec-
onds before the selected value is stored.
This is provided specifically so that some
turkey won’t accidentally change the refer-
ence level while they are playing around in
the configuration mode! Only if you know
the “secret” will you be able to store a new
value.
Dim Level
The dim function is used to reduce the
monitor output level by a preset amount.
The reduction is in dB relative to the monitor
output’s current level. There are four dim
level values available: 10, 15, 20, and 25 dB.
Downmix Stereo Mode
There are two modes available for the
downmix stereo mode. The difference
between the two modes relates to how
the sum of the SL, SR, BL, and BR chan-
nels are routed to the L output channel. In
mode 1 the sum of the signals are inverted
and then routed to the L output. In mode 2
the sum of the signals are directly routed
to the L output. Mode 1 is default and is
recommended for THX® monitoring appli-
cations. Mode 2 may be more appropriate
for general audio monitoring applications.
For details on the downmix stereo modes
please refer to the Technical Notes section
of this guide.
Downmix Mono Mode
There are two modes available for the
downmix mono mode. In mode 1 the L, R,
and C channels are summed and routed to
the C output channel. In mode 2 in addition
to the L, R, and C channels, the sum of the
SL, SR, BL, and BR channels are routed
to the C output. Mode 1 is default and is
recommended for THX® monitoring applica-
tions. It may also be appropriate for some
audio-with-picture applications. Mode 2 may
be useful for general audio monitoring appli-
cations. Refer to the Technical Notes section