Studio Technologies IFB Plus 2007 - Manual (Page 6)

Issue 9, January 2006 Model 2 User Guide
Page 6 Studio Technologies, Inc.
The Model 32A is intended for use by on-air
personnel, and contains a source switch,
along with an output level control. Either IFB
channel 1 or IFB channel 2 can be sent to the
talent, along with the desired audio “volume.”
For user convenience, both ¼-inch and 3.5
mm output jacks are provided.
The Model 33 is unique in that a “mix” of IFB
channels 1 and 2 can be created. Two level
controls, along with a source select switch,
allows camera and production personnel to
hear IFB cues from either or both channels.
This allows IFB signals intended for both
technician and talent to be simultaneously
monitored.
Model 2 Central Controller
Contained in a single rack space unit is ev-
erything required to implement a 2-channel
IFB system. Features include multiple pro-
gram inputs, telephone interfaces, voice-
operated (VOX) interrupt, level meters,
monitor amplifier, and internal interrupt mi-
crophone. Up to four Model 22 or Model 24
Access Stations can be connected to a Mod-
el 2, allowing producer or director positions
to access the IFB channels. In addition, up to
four Model 32A or Model 33 Talent Amplifiers
can be connected to a Model 2. The Model
32A and Model 33 allow personnel access
to the IFB channels using a single standard
microphone cable.
The Model 2 packs numerous features into
a single, 19-inch rack space. Standard con-
nectors are used throughout, including 3-pin
XLR-type, ¼-inch 2-conductor, 9-position
D-subminiature, and modular telephone
(RJ11-type) jacks. Power is supplied by stan-
dard 120 or 220/240 V (factory configured),
50/60 Hz via a detachable cord.
IFB Channels
The Model 2 contains two independent
IFB channels. Each channel has individual
controls and indicators, including program
source select switches, program level con-
trol, 5-segment LED level meter, and LED
status indicators. We’ll describe one channel
in this paragraph. Six switches allow the four
program inputs and incoming audio from
the two telephone interfaces to be selected
as program audio. A level control allows
adjustment of the program audio level
relative to the fixed interrupt audio level.
A 5-segment LED level meter displays the
composite IFB channel audio level, i.e., pro-
gram and interrupt audio level. The meter
facilitates the rapid setting of the program
level control, as well as providing a general
indication of the channel’s signal level.
Each channel’s composite IFB audio signal
(program and interrupt audio) is sent to four
places: line output, talent amplifier output,
telephone interface 2, and monitor amplifier.
The line outputs provide electronically bal-
anced, line-level signals that interface with
external equipment via two XLR-type con-
nectors. The talent amplifier output provides
channel 1 and 2 audio, along with +22 Vdc
power on one 3-pin XLR-type connector.
Any combination of up to four Model 32A or
Model 33s can be connected to the talent
amplifier output.
Program Inputs
The Model 2 contains four program inputs.
Each can be individually assigned to the
two IFB channels, with the ability to assign
multiple program inputs to an IFB channel.
Program signals enter the unit via four XLR-
type connectors on the back panel. The pro-
gram inputs are electronically balanced with
a nominal input impedance of 24 k ohms.