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Highlights
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Mode switch for flexible operation
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Excellent audio quality
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Low DC power consumption
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Compatible with standard broadcast circuits
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Compact, lightweight package
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1/4-inch and 3.5 mm output connectors
Overview
The Model 34 Talent
Amplifier is a self-contained listen-only “belt pack” unit that
drives talent earpieces or headsets. The unit is powered by, and
receives audio from, single- or dual-channel broadcast-standard IFB
or party-line intercom circuits. A 3-conductor microphone-type cable
links the IFB or intercom circuit with the Model 34’s input. The
unit’s resources were selected so that a range of single- and
dual-channel applications can be supported. For flexibility the
dual-channel audio output is provided on both ¼-inch and 3.5 mm
jacks. The jacks are 3-conductor and are compatible with both
monaural (2-conductor) and stereo (3-conductor) plugs. An LED
indicator lights whenever input power is present, providing setup
assistance and user confidence. The Model 34 is housed in a
lightweight, yet rugged, aluminum housing. A belt clip allows it to
be directly attached to clothing or accessories. An optional
mounting adapter is available, enabling the Model 34 to be installed
in a permanent location.
The Model 34 is
intended for use by on-air broadcast and production support
personnel. The unit provides two user-accessible rotary level
controls and an output mode switch. The switch is used to select how
the one or two audio input sources are routed to the connected
earpiece or headset. In the switch’s stereo position input channel 1
(XLR pin 2) is sent to the left output channel while input 2 (XLR
pin 3) is sent to the right output channel. The two controls allow
the left and right output levels to be independently set. When the
output mode switch is set to the mono position, a “mix” of input
channels 1 and 2 can be created. Using the level controls, camera or
production personnel can create a unique cue mix of either or both
audio inputs. This allows independent IFB signals, such as those
intended for use by on-air talent and technicians, to be
simultaneously monitored. By design, the Model 34’s level controls
cannot be set to fully attenuate (“mute”) the input sources. This
helps to ensure that users will never accidentally miss important
“cues” from directors or producers. While audio quality is not
normally considered a factor in IFB or intercom systems, the Model
34 is built to “pro audio” standards. This helps to ensure that the
best possible audio reproduction is provided.
The Model 34 is
compatible with virtually every standard broadcast IFB and
party-line intercom circuit. This type of circuit typically uses
3-pin XLR-type connectors for interfacing with connected equipment.
XLR pin 1 serves as common for DC power and audio. Pin 2 provides DC
power and, in the case of a dual-channel circuit, DC power and
channel 1 audio. Pin 3 provides channel 2 audio in dual-channel
systems or channel 1 audio in single-channel systems.
Model 34 units have
been tested for correct operation with IFB and intercom circuits
associated with systems from Telex®/RTS®, Clear-Com®, and Studio
Technologies. Good performance can be expected when the Model 34 is
used with IFB circuits associated with the ubiquitous RTS Model 4010
Central Controller and IFB-828 Interface. With IFB circuits provided
by interface units from Studio Technologies, excellent audio quality
and support for lengthy cable runs can be expected.
Model
34 Specifications
Applications: listen-only portable user
station compatible with standard single- and dual-channel broadcast IFB
and party-line intercom circuits
Connectors:
IFB/Intercom Input: 3-pin female XLR-type
Headphone/Earpiece Output: ¼-inch and 3.5 mm 3-conductor jacks
IFB/Intercom Input:
Compatibility: broadcast-standard single- or dual-channel IFB or
party-line intercom circuits
Wiring Scheme:
Pin 1: common for DC and audio
Pin 2: DC only (single-channel circuits) or DC with channel 1 audio
(dual-channel circuits)
Pin 3: channel 1 audio (single-channel circuits) or channel 2 audio
(dual-channel circuits)
Power Requirement: 18-35 volts DC, 20 mA nominal, 45 mA maximum with one
output channel shorted at full level
Headphone/Earpiece Output:
Compatibility: intended for connection to mono (2-conductor) or stereo
(3-conductor) headsets or earpieces with nominal impedance of 150 ohms
or greater
Type: 2-channel voltage driver
Input/Output Gain: 19 dB, maximum
Audio Routing–Switch Set to Stereo Mode: channel 1 (pin 2) input to left
channel output; channel 2 (pin 3) input to right
channel output
Audio Routing–Switch Set to Mono Mode: channels 1 & 2 summed (added)
then routed to both left and right channel outputs
Maximum Output Voltage: 8 Vpp, 1 kHz, 150 ohm load
Frequency Response: 40 Hz-20 kHz, ±1 dB, 150 ohm load
Distortion (THD+N): 0.03%, 1 kHz, 150 ohm load
Options: Model 36 Mounting Adapter allows
Model 34 to be permanently mounted
Dimensions (Overall):
3.25 inches wide (8.3 cm)
1.80 inches high (4.6 cm)
3.95 inches deep (10.0 cm)
Weight: 0.6 pounds (0.3 kg)
Specifications
subject to change without notice.
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