Studio Technologies 65 - Manual (Page 15)

Model 65 User Guide Issue 4, January 2004
Studio Technologies, Inc. Page 15
for Surround
Safety Warning: The Model 65 does
not contain an AC mains disconnect
switch. As such, the mains cord plug
serves as the disconnection device.
Safety consideration requires that the
plug and associated outlet be easily
accessible to allow rapid disconnec-
tion of mains power should it prove
necessary.
After mains power has been connected, a
power-up delay circuit prevents operation
for several seconds. This delay prevents
audio “pops” or other noise from being
sent out the main audio outputs and on to
the loudspeakers. Once the power-up delay
has elapsed, the Model 65’s power present
LED will light and the output muting relays
will change to their normal non-muted state.
The unit is now ready for years of trusty
service!
Configuration
While it is easy to install and use, the Model
65 does provide a number of configurable
parameters that can be used to “tune” an
installation for optimum performance.
From the factory, default settings have
been selected that are appropriate for many
installations. But don’t be lulled into compla-
cency by the fact that “out of the box” the
Model 65 may seemingly perform well in
an application. It’s critical to review how the
Model 65 functions within the scope of the
entire monitoring system. A system will only
meet its potential when all of the com-
ponents work together to achieve a
common goal.
The configurable parameters can be sepa-
rated into two groups: basic and advanced.
The basic parameters are high- pass filter
slope selection, low-pass filter slope selec-
tion, and subwoofer assignment. The
advanced parameters are high- and low-
pass filter frequency adjustment, as well
as adjustment of the LFE low-pass filter
frequency.
Warning: Mains power must be
disconnected prior to setting the
mode. Only a competent technician
must perform this procedure!
Basic Configuration
In this section the configuration of the main
input’s high- and low-pass filter slope will
be reviewed. Changes will be made if
necessary to meet the needs of the monitor
system. The bass management and LFE
signal routing to the subwoofer outputs will
be reviewed. Again, changes will be made
if required.
High-Pass Filter Slope Selection
Each of the five main input channels (L, C,
R, LS, and RS) includes a 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(s). Each filter section is
implemented by cascading (connecting in
series) two identical high-pass filter circuits.
Each filter circuit has a slope of 12dB-per-
octave and is factory selected to have its
–3dB point at nominally 80Hz. Option jump-
ers are provided to allow the audio signal
to pass through either or both of the filters,
providing a slope of 12- or 24dB-per-
octave. For added flexibility, an additional
jumper position allows the filter to be