Studio Technologies Model 220 Announcer's Console

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Product Code: 9999-06382
Studio Technologies Model 220
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Studio Technologies Model 220 Announcer's Console

Studio Technologies Model 220 Announcer's Console

Studio Technologies Model 220 Announcer's Console Details

Studio Technologies Model 220 Announcer's Console designed to serve as the audio control "hub" for announcers, commentators, and production talent. The tabletop unit is suited for numerous applications including on-air sports broadcasting. Studio Technologies Model 220 Announcer's Console is compatible with essentially all broadcast and audio system environments. Standard connectors are used to interface microphone, headphone, on-air, talkback, and IFB signals. Whether it's microphone switching, talkback output, or headphone cue feed, superior audio quality is maintained throughout. A microprocessor provides Studio Technologies Model 220's logic power, allowing exacting control of the unit's operation. With extensive flexibility built in, creating the desired operating configuration is a simple matter. While the operating features of the unit can be extensively configured, the user is presented with an easy-to-use set of controls and indicators. Power on the inside, simplicity during useâ?"that's the hallmark of Studio Technologies Model 220 Announcerâ??s Console.

A truly next-generation product, extensive research into the needs and desires of field production personnel was integral to Studio Technologies Model 220 Announcer's Console's creation. While primarily targeted for on-air television applications, specialized features are included to allow Studio Technologies Model 220 Announcer's Console to be used in a variety of other audio applications. These include on-air radio broadcasting, stadium announcement, and voice-over/narration booths.

Microphone Input

A high-performance microphone preamplifier circuit provides low-noise/low-distortion amplification over a 20 to 60 dB gain range. The gain is adjustable in 10 dB steps. The input is compatible with balanced dynamic or condenser microphones. The microphone power source is 48 volts nominal and meets the worldwide P48 phantom power standard. An LED indicator serves as an aid for optimizing the setting of the preamplifier's gain. The output of the microphone preamplifier is used by the main output as well as being routed to the compressor circuit that supports the talkback function.

Main and Talkback Outputs

Studio Technologies Model 220 Announcer's Console provides one main output that is designed to serve as the on-air, stadium announcement, or other primary audio feed. With a nominal level of â?"2 dBu, it is designed as a fully professional interface with high output capability, low distortion, and low noise. It features a high-quality transformer expressly designed for professional audio applications.

Talkback Functions

The two talkback outputs are intended to provide production trucks, control rooms, or support personnel with talent-originated cue signals. These outputs are transformer-coupled with +4 dBu nominal signal levels. They contain resistors in series with their output connections, allowing the talkback outputs from multiple units to be directly "summed." For non-on-air applications, a special Model 220 feature can be enabled, placing the unit in a "production" mode. This allows the main output to be used as a third talkback output. In this configuration the unit can be even more powerful when used in corporate or theatrical events, for example serving as a master console for a production director.

Dynamic Range Control

A studio-quality compressor circuit is provided to control the dynamic range of the signal coming from the microphone preamplifier. Far from a simple "clipper," the circuit utilizes a sophisticated laser-trimmed voltage-controlled-amplifier (VCA) integrated circuit for quiet, low-distortion level control. The signal from the compressor is always used by the talkback outputs. In addition, the audio source for the main output can be selected to be either the output of the microphone preamplifier or the output of the compressor. While possibly not appropriate for major on-air situations, having dynamic range control of the main output can offer increased performance for many applications. These could include stadium announcement positions, sports events using nonprofessional on-air talent, and situations where cable crosstalk is of concern.

User Controls and Status Indicators

Three pushbutton switches, four LED indicators, and two rotary controls provide the user with a clear, easy-to-use interface. One pushbutton switch controls the status of the main output. This is the audio output intended for on-air, announcement, or other primary uses. Two LEDs display the on/off status of the main output. Two additional pushbutton switches control the status of the talkback outputs. These are the audio outputs used to communicate with producers, directors, "spotters", or other behind-the-scenes production personnel. A status LED is associated with the talkback button. Two rotary controls allow the user to adjust the level of the headphone output.


A large part of Studio Technologies Model 220 Announcer's Console's unique power is the ability to configure the operation of the main output and talkback functions. To meet the needs of the many specific broadcast and production applications, a variety of button operating modes is available. The main output button can be selected to operate from among four modes. In the "push-to-mute" mode the button performs a momentary mute of the main output. In this way a "cough" button function is created, something typically required for television sports broadcasting. In the "push-to-talk" mode the button provides a momentary active function for the main output. This mode would be appropriate for applications such as stadium announcement. An alternate action "latching" configuration allows the button to enable or disable the main output as desired. This is useful in radio broadcasting, announce-booth, or voice-over applications. The fourth mode provides a hybrid function, supporting both push-to-talk and tap-to-enable/ tap-to-disable operation. This operation is similar to that found in many broadcast intercom system user stations. The two buttons associated with the talkback functions can be configured to operate from either of two modes. One of the modes supports a "push-to-talk" function. This is typically used for on-air broadcast applications. The other mode provides a hybrid function, the operation of which is discussed in the previous paragraph. The hybrid mode is especially useful when Studio Technologies Model 220 Announcer's Console is used in a production-support application.

In addition to the two modes provided for talkback 1, the button associated with talkback 2 supports three additional operating modes. One mode allows talkback 2 to be disabled. This is useful when only talkback 1 is to be utilized. The other two modes provide special momentary and hybrid functions. With these modes the operation of the main and talkback outputs are not impacted. This allows the talkback 2 button to control the state of Studio Technologies Model 220 Announcerâ??s Console's auxiliary relay, making specialized implementations possible. The main button mode configures how the main output, when it is in the "latched" on state, responds to talkback activity. One choice momentarily turns off the main output when talkback is active, returning the main output to the on state when the talkback function has ended. The other choice "unlatches" the main output in response to a talkback function.

IFB Input

A broadcast-standard "wet" (DC with audio) IFB circuit can be directly connected to Studio Technologies Model 220 Announcer's Console IFB input. Originated by sources such as the RTSâ"¢ 4000-series IFB system or IFB interface devices from Studio Technologies, the connected IFB circuit can provide the DC power to operate Studio Technologies Model 220 Announcer's Console as well as two channels of cue audio.

Cue Sources

Studio Technologies Model 220 Announcer's Console allows up to four audio sources to be selected for routing to the headphone output. The sources are IFB channel 1, IFB channel 2, line input 1, and line input 2. Each source can be individually assigned to the left channel, right channel, or both left and right. This allows a wide variety of stereo and mono headphone mixes to be created. The two audio signals associated with the IFB input can be assigned to the headphone output. Originating in production trailers, control rooms, or remote locations, these unbalanced sources normally provide DC power and program-with-interrupt audio on one channel and program-only audio on the other. For application flexibility, two line-level audio sources can also be connected to Studio Technologies Model 220 Announcer's Console. Possible signal sources include off-air receivers, wireless IFB systems, and audio consoles. The connected signals can be from two independent sources, or could be a stereo audio feed such as would be associated with a broadcast music event. Two trim potentiometers, located on the bottom of the unit, allow signals with wide nominal audio levels to be cleanly interfaced.

Headphone Output

Two rotary controls are provided for user adjustment of the headphone output levels. For application flexibility the actual function of the two "pots" is configurable. For traditional on-air sports applications they can be selected to the dual level control mode which provides independent control of the left- and right-channel volume. For use with stereo cue signals, or to support user preference, the level/balance mode can be selected. In this mode one control adjusts the overall level of both the left and right channels, while the other allows adjustment of the left/right level balance. To help minimize the chance of broadcast cues being missed, both level control modes can be configured so that a minimum headphone output level is maintained. Alternately, the headphone output can be set to fully mute when the controls are at their minimum position. The headphone output was designed to meet the needs of contemporary headphones and headsets. Specifically, the output circuits act as voltage, rather than power, drivers. In this configuration they can provide high output levels with very low distortion and noise, along with minimal current consumption. The output circuits are configured to safely drive stereo or mono loads. This ensures that all types of headphones, headsets, and earpieces can be directly connected.

Audio Quality and Protection

Studio Technologies Model 220 Announcer's Console's circuitry is carefully tailored to provide excellent audio performance. Professional-quality components are featured throughout. For reliability all audio routing is performed using solid-state devices. In all critical audio paths, "clickless" electronic switches provide noise-free control. All audio inputs and outputs make extensive use of protection components. This limits the chance of damage from ESD and other undesirable, yet real-world, hazards.

Power Sources

Studio Technologies Model 220 Announcer's Console can derive its operating power from either the IFB input or an external nominal 24 volt DC source. For redundancy, both power sources can be connected simultaneously. An internal switch-mode power supply ensures that all Model 220 features are available when the unit is powered by either source. Studio Technologies Model 220 Announcer's Console is compatible with IFB circuits provided by most standard broadcast systems. However, maximum performance can often be obtained by using the IFB interface devices available from Studio Technologies. They provide high-quality audio along with an excellent source of DC power. They're directly compatible with most matrix intercom systems, as well as standard line-level audio signals.

Auxiliary Relay

Studio Technologies Model 220 Announcer's Console's circuitry includes a general-purpose relay, allowing specialized configurations to be created. Under software control, the relay can be configured to follow the state of the mic, talkback 1, talkback 2 buttons. Taking advantage of the locations provided for additional XLR connectors, a technician may easily implement a variety of functions such as mic active indication, audio muting during talkback, or audio insertion control. Several modes were specifically included to allow direct control of the relay using the talkback 2 button, without impacting any of the audio signals. The auxiliary relay is also used by the optional direct microphone output card.


Studio Technologies Model 220 Announcer's Console configurations are made using a number of DIP switches and two trim potentiometers. One 8-position switch assembly is used to set the gain of the microphone preamplifier, the on/off status of phantom power. Another 8-position switch assembly is used to set the gain of the microphone preamplifier and the on/off status of phantom power. Another 8-position switch assembly configures which of the cue audio sources are routed to the headphone output. Two additional 8-position switch assemblies communicate the desired operating modes to the microprocessor. Two rotary trim pots are used to adjust the input sensitivity of the line inputs. All switches and trim pots are accessible via the bottom of Studio Technologies Model 220 Announcerâ??s Console's enclosure; the unit does not have to be disassembled. Changes made to any of the configuration parameters become active immediately. To prevent access to the configuration controls a security plate, included with each unit, is attached to the bottom of the enclosure.


Studio Technologies Model 220 Announcer's Console uses standard connectors throughout. The microphone, IFB and line inputs use 3-pin female XLR connectors. The main and talkback outputs use 3-pin male XLRs. A ¼-inch 3-conductor jack is used for the headphone output. The external source of 24 volt DC power is connected by way of a 2.1 x 5.5 mm "locking" coaxial power jack. In the world of broadcast and production audio it's fair to say that applications vary widely. To this end, up to three additional XLR connectors can easily be mounted into the Model 220's back panel. Multiple 3-position "headers" located on Studio Technologies Model 220 Announcer's Console's circuit board provide technician access to literally every input and output connection. Using a factory-available interface cable kit allows a Studio Technologies Model 220 Announcer's Console to be optimized to meet the exact needs of specific applications. For example, some applications may prefer to use a multi-pin XLR connector to interface with a headset. This can easily be accomplished by adding the appropriate 5-, 6-, or 7-pin XLR connector and making a few simple connections. Other applications may benefit from having "mult" or "loop-through" connections, something easily incorporated into a Studio Technologies Model 220 Announcer's Console. As previously mentioned, some broadcast applications use headsets that interface using a multi-pin connector. In most cases these connectors are 5-, 6-, or 7-pin male XLRs wired to an industry-standard pinout scheme. Studio Technologies offers headset connector assemblies that allow fast and painless installation into a spare connector location in Studio Technologies Model 220 Announcerâ??s Console back panel.


Studio Technologies Model 220 Announcerâ??s Console's standard resources are more than sufficient to directly support a large number of applications. But in the "real world" of audio and intercommunications special needs always seem to arise. To that end, Studio Technologies offers a number of option cards. In addition to passive or active components, each card contains an integral connector, allowing simple installation into a spare connector location on Studio Technologies Model 220 Announcerâ??s Console back panel. For interest, the resources provided by some of these option cards are worth describing. The direct microphone output card provides access to the dynamic or condenser microphone that is connected to Studio Technologies Model 220 Announcerâ??s Console mic input. Passive components, along with the auxiliary relay contact, create a "click-free" microphone-level audio signal. The remote switch input card uses a 4-pin XLR connector to provide access to the Studio Technologies Model 220 Announcerâ??s Console's remote switch inputs. The tally/remote switch input card provides a current-limited DC voltage that serves as a main output status signal. It also provides a remote switch input connection. Other general purpose option cards provide 3-pin XLR, 4-pin XLR, and 8-pin EtherCon® connectors. With the range of option cards available it's hard to imagine an application that can't be served.

Studio Technologies Model 220 Announcer's Console Features

  • Microphone preamp with selectable gain and 48 volt phantom power
  • Two Line-level inputs
  • Broadcast IFB input
  • Three pushbutton switches offer programmable "click-free" audio path control
  • Transformer-balanced main output
  • Two Line-level talkback outputs
  • Stereo headphone monitoring of selectable sources
  • Two rotary headphone output level controls
  • Microcontroller-directed audio routing
  • Auxiliary relay contact
  • Powered by IFB or external DC source
  • All configuration switches and trim potentiometers accessible via the bottom of enclosure

Studio Technologies Model 220 Announcer's Console Specifications

  • Manufacturer: Studio Technologies
  • Product: Model 220 Announcer's Console
  • Frequency Response: 10 Hz-20 kHz, ±0.2 dB, mic in/main out
  • Distortion (THD+N): 0.008%, measured at 1 kHz, mic in/main out
  • Signal to Noise Ratio: 86 dB, referenced to â?"42 dBu mic in/â?"2 dBu main out
  • Dynamic Range (A-weighted): 108 dB


  • Mic In, IFB In, Line In 1 & 2: 3-pin female XLR
  • Main Out, Talkback Out 1 & 2: 3-pin male XLR
  • Headphone Out: ¼-inch 3-conductor phone jack
  • 24 Vdc Power In: Coaxial power jack, 2.1 x 5.5 mm, locking bushing, compatible with Switchcraft S760K plug
  • 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, nominal
  • CMRR: >80 dB, 20 Hz-20 kHz, 40 dB gain
  • Gain Range: 20 to 60 dB, nominal, adjustable in 10 dB steps
  • Compatibility: Dynamic or phantom-powered mics
  • Phantom Power: 48 Vdc, nominal, meets IEC 1938 P48 standard

IFB Input

  • Type: 2-channel, unbalanced (pin 1 common; pin 2 DC with channel 1 audio; pin 3 channel 2 audio)
  • Impedance: 10 k ohms, nominal
  • Nominal Level: â?"10 dBu

Line Inputs

  • Inputs: 2
  • Type: Balanced, transformer-coupled
  • Impedance: 10 k ohms, nominal
  • Nominal Level: â?"12 dBV to +6 dBu, adjustable


  • Threshold: 2 dB above nominal level
  • Attack/Release Time: 2 mSec/100 mSec, nominal
  • Slope: 5:1, nominal
  • Status LED: Compressor active

Main Output

  • Type: Balanced, transformer-coupled
  • Nominal Level: â?"2 dBu
  • Maximum Level: +20 dBu into 2 k ohms
  • Impedance: 100 ohms, nominal

Talkback Output

  • Outputs: 2
  • Type: Transformer-coupled with series capacitors and isolation resistors
  • Impedance: 600 ohms, nominal
  • Nominal Level: +4 dBu
  • Maximum Level: +11 dBu (compressor restricts maximum)

Headphone Output

  • Output: 1, Stereo
  • Compatibility: Mono or stereo headphones or headsets with nominal impedance of 100 ohms or greater
  • Type: Voltage Driver
  • Max. Output Voltage: 12 Vpp, 150 ohm load

Auxiliary Relay

  • Function: Software Configurable
  • Contacts: 2, form C (Common, Normally Closed, Normally Open)
  • Rating: 1 A, 30 W (resistive)
  • Access: Requires user-implemented connector scheme

Power Sources

  • IFB: 24-32 volts DC, 125 mA
  • External: 24 volts DC nominal, 80 mA @ 24 volts DC; acceptable range 20-30
  • Volts DC: Each unit shipped with a universal input/24 Vdc output power supply


  • Width: 8.1 inches wide (20.6 cm)
  • Height: 3.3 inches high (8.4 cm)
  • Depth: 8.5 inches deep (22.4 cm)
  • Weight: 4.5 pounds (2.1 kg)

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