Studio Technologies 65 - Manual (Page 10)

Issue 4, January 2004 Model 65 User Guide
Page 10 Studio Technologies, Inc.
for Surround
The high- and low-pass filters sections
associated with the main inputs are imple-
mented by cascading two 2
nd -order Sallen-
Key filter circuits. Jumpers on the Model
65’s printed circuit board allow individual
selection of 12dB-per-octave or 24dB-per-
octave response. The factory-default con-
figuration for the high-pass filters is 12dB-per-
octave, complementing the internal filters
contained in many amplified loudspeaker
systems. Other speaker systems may
benefit from the use of the 24dB-per-octave
setting. A third jumper position allows the
input signal to be directly routed to the
output. This “flat” selection supports loud-
speaker systems that already contain filters
to provide the desired high-pass response.
As for the low-pass filters, the factory con-
figuration is 24dB-per-octave, supporting the
needs of many subwoofer loudspeakers.
Alternately, the 12dB-per-octave settings
can be used to match the Model 65 with
other monitor systems.
The high- and low-pass filter frequencies
associated with the main inputs can be
individually adjusted. This allows the cross-
over frequencies to be configured on a
channel-by-channel basis. While the factory
default crossover frequency is set for nomi-
nally 80Hz, selecting an alternate crossover
frequency, symmetrical or asymmetrical, is
simple. To adjust any of these filters re-
quires only changing resistors. Sockets are
present in the Model 65’s circuit board,
eliminating the need to solder.
The LFE low-pass filter frequency can also
be adjusted. The factory-default value is
120Hz, but can easily be revised.
Installation
In this section you will be installing the Model
65 Bass Manager in an equipment rack.
Audio input and output connections will be
made. If required, external equipment will be
interfaced to the remote control inputs. In
special applications, multiple Model 65s will
be interconnected. AC mains power will be
connected to the Model 65.
Prior to beginning the installation process,
a thorough review of the configuration
section is recommended. While it’s pos-
sible to use the Model 65 directly “out of the
box,” some configuration changes may add
significantly to the performance of a com-
pleted installation.
System Components
The shipping carton contains one each
of the following: Model 65 Bass Manager,
user guide, and warranty card. Units des-
tined for North America also include an AC
mains cord. Your dealer or distributor will
provide an AC mains cord for non-North
American destinations.
Mounting the Model 65
The Model 65 requires one space in a
standard 19-inch (48.3cm) equipment rack.
It is desirable to locate the Model 65 to
allow access to both the front and the back
panels. The back panel contains the input
and output connectors. The front panel is
used to access several operator controls.
The Model 65 is secured to the equipment
rack using two mounting screws per side.