The Model 233 Announcer’s Console is the premier audio control
“hub” for announcers, commentators, and live-event production
personnel. Compatible with essentially all broadcast and pro-
duction audio system environments, the tabletop unit is ideally
suited for numerous applications including stadium announce,
on-air television, and radio broadcasting.
Flexible Setup
Three pushbutton switches—Main, Talkback 1, and Talkback 2
—operate under microprocessor control to offer unmatched
flexibility and “click-free” audio routing. The Main button controls
the main output with operating modes that include push-to-
mute (cough), push-to-talk, and latching. The Talkback 1 and
Talkback 2 buttons control dedicated line-level outputs to pro-
vide talent-originated cue signals to production personnel. The
Talkback buttons can also be configured to send audio to the
dual-channel intercom interface. “Stadium announce” mode and
“production” mode enable special feature sets for these applica-
tions. Simple customization of the button labels ensures the user
is presented with an easy-to-use set of controls and indicators.
Superior Audio
Featuring a studio-inspired low-noise/low-distortion preampli-
fier design, adjustable gain, and 48 volt phantom power, the
Model 233 is compatible with balanced dynamic and condenser
microphones. With high output capability and the use of an
output transformer expressly designed for professional audio ap-
plications, the main output offers broadcast-quality audio as the
stadium announcement, on-air, or other primary audio feed.
Key Features:
• Microphone preamp with selectable gain and 48 volt
phantom power
• Two line-level inputs
• Three pushbutton switches offer programmable
“click-free” audio path control
• Transformer-balanced main output
• Two line-level talkback outputs
• Dual-channel intercom interface with “auto-terminate”
• Stereo headphone monitoring of selectable sources and
integrated sidetone
• Three rotary headphone output level controls for external
sources and sidetone
• Microcontroller-directed audio routing
• Tally status output and auxiliary relay contacts
• Powered by intercom or by supplied external DC source
• All configuration switches and trim potentiometers
accessible via the bottom of the enclosure
Powerful Monitoring
The headphone output’s circuitry provides high output levels
with very low distortion and noise. The user can monitor up to
four external audio sources: line input 1, line input 2, intercom
channel 1, and intercom channel 2. Possible signal sources for
the line-level inputs include off-air receivers, wireless IFB sys-
tems, and audio consoles. The Model 233’s intercom interface is
compatible with standard party-line intercom systems from manu-
facturers such as RTS™ and Clear-Com®. If desired, broadcast
IFB can also be connected to the intercom input. Each source can
be individually assigned to the left, right, or both channels of the
binaural headphone output. Three rotary controls allow the user
to adjust the levels of the externally connected sources and the
user’s sidetone. Studio Technologies’ unique “auto-terminate”
feature ensures talkback-to-intercom “squeal” will never occur in
the headphone output if an intercom line is disconnected.
Speedy Configuration
Model 233 configurations are made using DIP-type switches and
trim potentiometers that are accessible via the bottom of the
enclosure. No disassembly is required. An included security panel
attaches to the bottom of the enclosure to limit access.
50338-1208, Issue 1
Installer Friendly
The Model 233 can be powered by the intercom interface or the
supplied external 24 volt DC source. Regardless of the power source
used, the console is always fully operational including 48 volt phantom
power. Audio inputs and outputs utilize industry-standard 3-pin XLR-
type connections. To meet the exact needs of specific applications,
three spare connector locations are available on the Model 233’s back
panel. Factory-available assemblies and card kits allow a technician to
customize these spare locations to accept a 6- or 7-pin XLR-type headset or to bring the auxiliary relay contacts or tally output to an
XLR connector. Additional card kits, available from Studio Technologies, include direct microphone output and remote switch input.
Model 233 Back Panel
Specifications
General Audio:
Frequency Response: 20 Hz-20 kHz, ±0.1 dB,
mic in/main out
Distortion (THD+N): 0.008%, measured at 1 kHz,
mic in/main out
S/N Ratio: 80 dB, referenced to –46 dBu mic in/
–2 dBu main out
Connectors:
Mic In, Line In 1 & 2, Intercom Interface: 3-pin
female XLR-type
Main Out, Talkback Out 1 & 2: 3-pin male XLR-type
Headphone Out: ¼-inch 3-conductor phone jack
24 Vdc Power In: 2.1 x 5.5 mm coaxial power jack
Spare Connector Locations: 3
Allows up to three Neutrik NC*D-L-1 connectors to
be installed (*=3F, 3M, 5F, 5M, 6F, 6FS, etc.)
Microphone Input/Preamplifier:
Type: electronically balanced
Input Impedance: 2 k ohms
Gain Range: 20 to 60 dB, adjustable in 10 dB steps
Compatibility: dynamic or phantom-powered mics
Phantom Power: 48 Vdc, nominal, meets IEC 61938
Compressor:
Threshold: 2 dB above nominal level
Attack/Release Time: 2 mSec/100 mSec
Slope: 5:1
Line Inputs: 2
Type: balanced, transformer-coupled
Impedance: 10 k ohms
Nominal Level: –12 dBV to +6 dBu, adjustable
Intercom Interface:
Type: 2-channel, unbalanced (pin 1 common; pin 2
DC with channel 1 audio; pin 3 channel 2 audio)
Compatibility: single- and dual-channel intercom
systems such as from RTS™ and Clear-Com®
Impedance: 10 k ohms
Nominal Level: –10 dBu
Main Output:
Type: balanced, transformer-coupled
Nominal Level: –2 dBu
Maximum Level: +20 dBu into 2 k ohms
Impedance: 100 ohms
Line-Level Talkback Outputs: 2
Type: transformer-coupled with series capacitors
and isolation resistors
Impedance: 600 ohms
Nominal Level: +4 dBu
Maximum Level: +11 dBu (compressor restricts
maximum)
Headphone Output: 1, binaural (stereo)
Compatibility: intended for connection to mono
or stereo headphones or headsets with nominal
impedance of 100 ohms or greater
Type: voltage driver
Maximum Output Voltage: 8 Vpp, 150 ohm load
Auxiliary Relay:
Contacts: 2, form C (Common, Normally Closed,
Normally Open)
Rating: 1 A, 30 W (resistive)
Tally Output: 3.5 Vdc, 12 mA maximum, nominal
Power Sources:
Intercom Interface: 24-32 Vdc, 125 mA
External: 24 Vdc, 90 mA; acceptable range
20-30 Vdc. All units include a universal input/
24 Vdc output power supply.
Dimensions (Overall):
8.1 inches wide (20.6 cm)
3.3 inches high (8.4 cm)
8.5 inches deep (22.4 cm)
Weight: 4.5 pounds (2.1 kg)
Specifications subject to change without notice.
Additional Model 233 information can be
downloaded from www.studio-tech.com.
Downloads include:
•
User Guide
•
Block Diagram
•
Configuration Guide
•
Model 200-Series Accessories Installation &
Configuration Guide
Studio Technologies, Inc.
Skokie, Illinois USA
+1 847-676-9177
© by Studio Technologies, Inc.,
December 2008
www.studio-tech.com
Studio Technologies, Inc. Model 233 Announcer’s Console, Issue 1, Page 2
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