Sonifex Talkback intercom brochure
Talkback - Desktop and
Rackmounted Systems
August 2008
t: +44 (0)1933 650 700
f: +44 (0)1933 650 726
[email protected]
Talkback - Desktop and Rackmounted Systems
There are 4 products in the Sonifex Talkback Intercom range :
TB-6D 6 Way Talkback Intercom, desktop free standing
TB-6R 6 Way Talkback Intercom, 19” rack mounted
TB-SD Station Master Talkback Intercom, desktop free standing
TB-SR Station Master Talkback Intercom, 19” rack mounted
The TB-6D and TB-6R are general talkback interfaces which
can be connected together to form a talkback system. The
TB-SD and TB-SR are talkback units which only operate when
connected to the Sonifex Station Master studio switcher.
The TB-6D and TB-6R are used for general
talkback between studios and use DC
signalling, also known as ground lifting or
ground signalling, to communicate with
each other. These units can be installed
in various locations throughout a studio
complex and linked to one another, with
each unit being able to talkback to up to
6 others connected together. Most other
talkback systems in general operation
also use DC signalling, so you should be
able to add these units into an existing
Desktop Or Rackmount
The TB-6D and TB-6R are identical in
operation, with the TB-6D used for
desktop operation and the TB-6R available
as a 2U rack-mount, for use for example,
in a central apparatus room or central
technical area.
TB-6D 6 Way Talkback Intercom Front View.
Talkback For Up To 7 locations
Up to 7 locations or studios can
communicate with each other.
On each panel, there are 6 front panel
buttons for talkback selection and 2 for
external inputs. When a button is pressed,
the button lights up and the talkback is
active to that location.
The TB-6D is used for
communicating with up to six
other locations using the onboard
electret mic. It can also monitor two
external sources.
Onboard Electret Mic
or External Mic
You can speak to the separate locations
using the onboard front-panel electret mic
or there is a separate external mic input on a
3 pin XLR female connector, into which you
can plug a suitable gooseneck microphone.
There is a rear panel switch to select
between the electret and separate input
mic. The mic input gain range is adjustable
via a rear panel preset pot between 74dB
and 53dB.
Monitoring External Inputs
The unit can monitor two external sources.
The EXT 1 input is a balanced stereo input
on a rear panel 9 pin D-type socket. The EXT
2 input is an unbalanced stereo input on the
9 pin D-type socket as well as dual phono
sockets. EXT 1 is useful for monitoring a
distributed signal, such as a radio tuner offair feed, or an outside source routed from an
ISDN codec. EXT 2 is useful for monitoring
a local source, such as a portable minidisc/
flashcard recorder/player, or the unbalanced
soundcard output from a PC editing/
playback package.
TB-6D & TB-6R 6 Way
Talkback Intercoms
The talkback outputs and input are
balanced signals on a 15-way male
D-type plug and the talkback input can be
adjusted from -28dB to 9dB using a rear
panel preset pot.
Talkback refers to the standard method of
communication between broadcast studios.
Each studio has either a desktop, a rackmount, or mixer-mounted intercom, usually
containing a row of switch buttons. Each
switch button connects to another studio when pressed, and
routes the presenter audio to it.
Press & Release,
Press & Hold Operation
The buttons work with both a momentary
and latched operation. If you simply
press the button, talkback will be on and
can be cancelled by pressing the button
again. If you press and hold the button,
the selection is cancelled when released.
So, if you wanted to listen to an external
input, such as the radio station feed,
or off-air monitor, you could simply
press the EXT 1 button. If you receive
talkback from another studio when
the external input buttons are also
pressed, the external inputs can be
either muted or mixed, depending on the
setting of an internal jumper.
TB-6D Rear View.
If you already use a mixer which has a
talkback input and output, or continuous
talkback output, or just a line level output
which you want to use, by changing internal
jumpers the intercom can be configured
to use these connections instead of the
on-board microphone and speaker/
headphones. For example, if you have a mic
channel on a mixer assigned to talkback
and the presenter is using headphones for
monitoring the mixer talkback, the
Talkback Intercom can be used purely for
talkback switching and for monitoring
external inputs.
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Talkback - Desktop and Rackmounted Systems
D-type External Input connector, for
example, when used in an area with
live microphones. Both monitor and
headphone levels are fully adjustable
between -60dB and 9dB using the front
panel volume control.
TB-6R Front View.
Built-in Loudspeaker
& Headphones
For monitoring, you can use either the
built-in 1W loudspeaker, or headphones
on a 6.35mm unbalanced stereo jack. The
TB-6R Rear View.
Radio Studio Application Using TB-6D & TB-6R
A typical application would be to
distribute talkback and audio feeds
around a radio or TV studio complex,
as in this diagram.
The TB-6D and TB-6R units are daisychained together from location to location
headphones provide 150mW into 32-600Ω
headphones. When the headphones are
used, the speaker is automatically muted.
Additionally, the monitor speaker can be
muted via a remote contact on the 9 pin
and the radio station output from an
off-air receiver is distributed on input
EXT 1 of each unit.
The EXT 2 input could be used in the news
or sales area for monitoring local sources
such as a PC audio output.
Linking the studios in this way allows
all locations to talk to each other together
with the ability to monitor 2 external
feeds, with independent control of
monitor muting and headphone/
speaker levels.
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Talkback - Desktop and Rackmounted Systems
Radio Studio Application Using TB-SD & TB-SR
around a small radio station, as in
this diagram.
The TB-SD and TB-SR intercoms are
connected to the Station Master in a
star pattern, with the Station Master
as the central hub and unbalanced
point-to-point links from it to each
location. This setup could also be used
for controlling on-air switching and for
distribution of the external inputs to the
other locations.
Using the Station Master as the core of a
complete studio air-switching, distribution
and talkback system, up to 4 studios can
be connected using the TB-SD and TB-SR.
A typical application would be to
distribute talkback and audio feeds
Station Master Talkback
Intercom Overview
These units are used for interfacing with the
Sonifex Station Master studio switcher and
are similar to the 6 way talkback intercoms,
except that the talkback routing and
switching (DC signalling) is handled by the
Station Master.
TB-SR Front View.
TB-SR can be used to communicate with up
to 4 other locations (including the Station
Master), or all of the locations by pressing
the “ALL” button.
female D-type. This contains switch and
indicator controls for the 4 talkback buttons
together with power and talkback input/
output/control lines to and from
the Station Master.
Whereas the TB-6D and TB-6R have talkback
outputs and input on a 15-way male D-type
plug, the TB-SD and TB-SR have instead
a remotes socket consisting of a 25-way
TB-SR Rear View.
TB-SD Front View.
Talkback For Up To 5 Locations
Although similar to the TB-6D,
the TB-SD talkback intercom is used
for interfacing with the Sonifex
Station Master.
TB-SD Rear View.
All of the features regarding level
control, use of the microphone, speaker,
headphones, volume control and external
inputs are the same as for the TB-6D and
TB-6R intercoms. However, the TB-SD and
Tel: +44 (0)1933 650 700 Fax: +44 (0)1933 650 726 Email: [email protected] Internet:
Talkback - Desktop and Rackmounted Systems
Talkback Intercom Systems Block Diagram
Talkback Intercoms Technical Specification
• Provide talkback for up to 7 locations
(TB-6D & TB-6R) or 5 locations (TB-SD
& TB-SR).
• Brightly lit push-to-talk buttons.
• Momentary or latched buttons.
• Built-in electret microphone, with input for external microphone.
• Monitoring of 2 external inputs,
e.g. for off-air receiver.
• Auto-muting, or mixing, of external
inputs, when talkback is active.
• Integrates with Sonifex S2 mixer and is compatible with other
talkback systems.
Sonifex S2 Mixer Meterbridge
Talkback Panels
For details of the Meterbridge Panels
see Mixing Console pages.
Audio & Power Specification
Talkback Input/Outputs
15 way male D-type plug (TB-6D & TB-6R) for 6 balanced talkback outputs and 1 balanced talkback input
Talkback Input Gain Range
9dB to -28dB adjusted by rear panel preset pot
External Inputs & Mute
9 way female D-type socket, for stereo balanced external input 1, stereo
unbalanced external input 2 (or external talkback input/output), talkback
control output and mute input
External Input 2 Dual phono socket, stereo unbalanced in parallel with the 9 way female
D-type socket
External Inputs Impedance > 30kΩ unbalanced
> 40kΩ balanced
External Talkback Input Impedance > 30kΩ unbalanced
External Talkback Output Impedance < 80Ω unbalanced
External Microphone Input
3 pin female XLR socket
Mic Input Impedance
1.5kΩ balanced
Microphone Input Gain Range
74dB to 53dB adjusted by rear panel preset pot
Headphone Output
6.35mm (1/4”) jack, unbalanced stereo capable of driving 150mW into 32-600Ω headphones
Headphone Output Gain Range
9dB to <-60dB (off ) adjusted by front panel pot
Station Master Remotes
25 way female D-type socket (TB-SD & TB-SR)
Loudspeaker Power
Mains Input Power
85V - 264V AC, 47-63Hz, max 10W
Fuse Holder
1A anti-surge fuse
Physical Specification
Order Code Description
6 Way Talkback intercom, 6.1cm
desk units
Station Master Talkback
intercom, desk units
6 Way Talkback intercom, 8.9cm
48.3cm 18.5cm
19” rack mounted
3.5” 19” 7.3”
TB-SR Station Master Talkback (2U)
(19” rack)
intercom, 19” rack mounted
(48cm rack)
Total Nett Weight
Total Gross Weight
5.7lb 4.0kg
Tel: +44 (0)1933 650 700 Fax: +44 (0)1933 650 726 Email: [email protected] Internet:
t:+44 (0)1933 650 700
f:+44 (0)1933 650 726
[email protected]
61 Station Road
Nor thants NN9 5QE
United Kingdom
Phistersvej 31, 2900 Hellerup, Danmark
Telefon 3946 0000, fax 3946 0040
- pro audio with a smile
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