Studio Technologies 212 Users Manual

The Model 212 Announcer’s Console is an audio control “hub”

for announcers, commentators, and production personnel that

features digital audio input and output resources. The broadcast-

standard interfaces allow direct integration of the table-top unit

into contemporary “all-digital” environments.

Key Features:

• Microphone preamp with selectable gain and 48 volt

phantom power

• Two digital audio input channels

• Two pushbutton switches offer programmable “click-free”

audio path control

• Digital audio main and talkback output channels

• Digital interfaces directly compatible with unbalanced

AES digital audio signals

• Bidirectional digital interface for direct integration with

Riedel® intercom systems

• Stereo headphone monitoring of selectable sources

• Two rotary headphone output level controls

• Microcontroller-directed audio routing

• All configuration switches accessible via the bottom of

the enclosure

Flexible Setup

Two pushbutton switches—Main and Talkback—operate under

microprocessor control to offer unmatched flexibility and “click-

free” audio routing. The Main button controls the main output

audio channel with operating modes that include push-to-mute

(cough), push-to-talk, and latching. The Talkback button controls

an audio channel that provides talent-oriented cue signals to

production personnel. Both channels are formatted into an AES

digital audio “stream” that is routed to two BNC interfaces: an

AES3id-compliant output and a bidirectional digital interface for

direct integration with Riedel intercom systems. For non-on-air

applications a special feature set referred to as “production”

mode can be enabled. 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 212 is compatible with balanced dynamic and condenser

microphones. A sophisticated compressor circuit controls the

dynamic range of the audio signal from the microphone preampli-

fier to ensure the main output offers faultless performance as

the on-air or other primary audio feed.

Powerful Monitoring

The headphone output’s circuitry provides high output levels

with very low distortion and noise. The user can monitor audio

channels from among the three digital audio sources: the AES3id

input, the bidirectional digital interface, and an optionally imple-

mented AES3 input. Each source can be individually assigned to

the left, right, or both channels of the binaural headphone output.

Two rotary controls allow the user to adjust the headphone

output levels.

Speedy Configuration

Model 212 configurations are made using DIP-type switches 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.

50334-1208, Issue 1

Installer Friendly

The Model 212 is powered by the supplied external 24 volt DC source. Audio inputs

and outputs utilize industry-standard connections—XLR for the microphone and 75 ohm

BNC for the digital inputs and outputs. Two spare connector locations are available on

the Model 212’s back panel. Factory-available assemblies and card kits allow a techni-

cian to customize these spare locations to accept a 6- or 7-pin XLR-type headset or to

bring remote switch inputs to an XLR connector. Additional card kits include balanced

110 ohm (AES3) digital input or output connections, direct microphone output, and

line-level input. The optional rack-mounted Model 44 Interface can provide power and

signal routing over Ethernet-style interface cables to up to six Model 212 units (EtherCon® Connector Card Kit required).

Specifications

General Audio:

Frequency Response: < –0.1 dB at 20 Hz, –1 dB
at 18 kHz, mic in/main out
Distortion (THD+N): 0.025%, measured at 1 kHz,
mic in/main out
S/N Ratio: 71 dB, referenced to –46 dBu mic in/
–14 dBFS out
Common Mode Rejection Ratio: 68 dB at 60 Hz

Connectors:

Mic In: 3-pin female XLR-type
AES3id Out, AES3id In, Bidirectional Interface:
75 ohm BNC
Headphone Out: ¼-inch 3-conductor phone jack
24 Vdc Power In: 2.1 x 5.5 mm coaxial power jack

Spare Connector Locations: 2
Allows one or two Neutrik NC*D-L-1 connectors
to be installed (*=3F, 3M, 5F, 5M, 6F, 6FS, etc.)

Digital Inputs/Outputs:

A/D, D/A Converters: 24 bit, 100 dB dynamic
range
Sampling Rate: internal clock source 48 kHz,
external clock source 32 to 96 kHz
AES3id In: unbalanced, transformer-coupled
Impedance: 75 ohms
AES3id Out: unbalanced, transformer-coupled
Impedance: 75 ohms
Bidirectional: unbalanced transformer-coupled
Impedance: 75 ohms
AES3 In: balanced, transformer-coupled
(via optional connector)
Impedance: 110 ohms
AES3 Out: balanced, transformer-coupled
(via optional connector)
Impedance: 110 ohms

Microphone Input/Preamplifier:

Type: electronically balanced
Input Impedance: 2 k ohms, nominal
Gain Range: 10 to 50 dB, nominal, adjustable in
10 dB steps
Compatibility: dynamic or phantom-powered mics
Phantom Power: 48 Vdc, nominal, meets IEC 61938

Compressor:

Threshold: switchable –14 dBFS/–4 dBFS
Attack/Release Time: 2 mSec/100 mSec, nominal
Slope: 5:1, nominal

Optional Line Inputs: 2
Type: balanced, transformer-coupled
Impedance: 10 k ohms, nominal
Nominal Level: +4 dBu

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:

Function: software configurable
Contacts: 2, form C (Common, Normally Closed,
Normally Open)
Rating: 1 A, 30 W (resistive)

Power Source:

24 Vdc nominal, 150 mA max; acceptable range
20-30 Vdc. All units include a universal input/
24 Vdc output power supply.

Dimensions (Overall):

5.6 inches wide (14.2 cm)

3.3 inches high (8.4 cm)

8.5 inches deep (22.4 cm)
Weight: 3.2 pounds (1.45 kg)

Specifications subject to change without notice.

Model 212 Back Panel

Additional Model 212 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
[phone]
© by Studio Technologies, Inc.,
December 2008

www.studio-tech.com

Studio Technologies, Inc. Model 212 Announcer’s Console, Issue 1, Page 2