Studio Technologies 78 2004 - Manual (Page 31)

Model 78/79 User Guide Issue 5, January 2004
Studio Technologies, Inc. Page 31
for Surround
Remote Controls
Three remote control signals can be con-
nected to the system and configured for
the desired operating characteristics: mute
all, dim, and input select. When remote
mute all is activated the LED on the Model
79 associated with mute all will flash. If
mute all was already active when the
remote mute all function is activated, the
LED will change from being steadily lit to
flashing.
When Remote Dim is activated the LED
on the Model 79 associated with the dim
function will flash. If dim was already active
when remote dim is activated, the LED will
change from being steadily lit to flashing.
When remote input select is activated, the
LED on the Model 79 associated with the
selected input will flash. If the function is
set for exclusive, the other input LED will
not be lit. If the function is set for non-
exclusive, the LED associated with remote
input select will flash, while the LED as-
sociated with any other active input will
remain steadily lit.
Technical Notes
Bass Management Review
and Configuration
While easy to install and use as configured
at the factory, the Model 78 does provide a
number of bass management parameters
that can be used to “tune” an installation
for optimum bass management perfor-
mance. The default settings were selected
to provide appropriate performance for
many installations. But don’t be lulled into
complacency by the fact that “out of the
box” the Model 78 may seemingly perform
well in an application. It’s critical to review
how the Model 78 functions within the
scope of the entire monitoring system. A
system will only meet its potential when
all of the components work together to
achieve a common goal.
Warning: mains power must be
disconnected prior to performing any
changes to the bass management
parameters. Only a competent techni-
cian must perform this procedure!
Basic Configuration
In this section the configuration of the main
input’s high- and low-pass filters will be
reviewed. Changes will be made if nec-
essary to meet the needs of the monitor
system. The bass management signals
being routed to the subwoofer output will
be reviewed. Again, changes will be made
if required.
Main Inputs High-Pass Filters
Each of the seven main input channels
(L, R, C, SL, SR, BL, and BR) includes
an independent high-pass filter section.
These filter sections remove the audio-
frequency content that is to be routed,
by way of the low-pass filters, to the sub-
woofer output. The filter sections are imple-
mented by means of operational amplifier
high-pass filter circuits. The filter circuits
have a slope of 12 dB/octave and are fac-
tory selected to have their –3 dB point at
nominally 80 Hz. For flexibility, two jumper
positions allow each filter to be inserted
into, or removed from, the signal path. The
two jumper positions are designated as
12 dB/ocatve and flat.