Studio Technologies MODEL 2A
IFB Plus Central Controller


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List Price: $1,795.00
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The Model 2A Central Controller is an integrated 2-channel IFB unit intended for applications where space is at a premium, yet high performance is still required. The unit contains everything required to implement a full-featured system in a single space (1U) of a 19-inch rack enclosure. The unit's resources include multiple program inputs, integral telephone interfaces, monitor amplifier output, internal interrupt microphone, and support for additional talk locations. The unit's power input can range from 100 to 240 volts, 50/60 hertz. This "universal input" ensures correct operation virtually anywhere in the world.

Mounted in a single space of a 19-inch rack, the Model 2A provides everything required to implement a 2-channel IFB system. Features include multiple program inputs, telephone interfaces, voice-operated (VOX) interrupt, level meters, monitor amplifier output, and an internal interrupt microphone. In addition, up to four Model 22 or Model 24 Access Stations can be connected to a Model 2A, allowing producer or director positions to access the IFB channels. In addition, up to six Model 32A or Model 33A Talent Amplifiers can be connected to a Model 2A. These portable "beltpack" units interconnect with a Model 2A using standard microphone cables. Both DC power and two channels of audio are supplied on just one 3-conductor cable, providing personnel with convenient, reliable access to the two IFB channels.

The Model 2A packs numerous features into a rugged yet lightweight single-rack-space (1U) enclosure. Standard connectors are used throughout, including 3-pin XLR, ¼-inch 2-conductor, 9-position D-subminiature, and modular telephone (RJ11) jacks. A source of 100-240 volts, 50/60 hertz is connected via a detachable mains cord and provides power for the Model 2A.

Studio Technologies Model 2A Specifications:

  • Overall Frequency Response: 20 Hz to 20 kHz, –0.3 dB @ 20 Hz, –0.8 dB @ 20 kHz
  • Distortion (THD+N): 0.008%
  • S/N Ratio: 89 dB, ref. +4 dBu nominal
  • Interrupt Audio Compressor/Limiters: one per IFB channel, studio quality, dual slope, threshold 1 dB above nominal
  • Connectors:
    • Access Station: DE-9F (9-pin D-subminiature, female)
    • Program and Aux Audio Inputs: 3-pin female XLR
    • Line Outputs: 3-pin male XLR
    • Talent Amplifier Output: 3-pin male XLR
    • Telephone Interfaces: 2, RJ11 modular jack (6-position modular with pins 3 and 4 implemented)
    • Monitor Amplifier Output: 1/4", 2-conductor phone jack
    • AC Mains Input: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
    • Internal Interrupt Microphone: electret condenser
  • Program Inputs: 4
    • Type: electronically balanced, direct coupled
    • Impedance: 24 k ohms
    • Level: +4 dBu, nominal, trim adjustable over a range of –10 to +8 dBu
  • Auxiliary Audio Input:
    • Type: electronically balanced, direct coupled
    • Impedance: 24 k ohms
    • Level: +4 dBu, nominal, trim adjustable over a range of –10 to +8 dBu
    • Application: used with voice operated (VOX) interrupt function
  • Line Outputs: 2, 1 per IFB channel
    • Type: electronically balanced, capacitor coupled, intended to drive 2000 ohm or greater loads
    • Level: +4 dBu, nominal, +25 dBu maximum
  • Talent Amplifier Output:
    • Applications: provides power and audio signals for up to six Model 32A or Model 33A Talent Amplifiers; also allows connection of party-line (PL) intercom beltpacks Connections: common on pin 1, DC (+24 volts DC nominal) modulated with channel 1 audio (–10 dBu nominal) on pin 2, and channel 2 audio (–10 dBu nominal) on pin 3
    • Output Impedance: 200 ohms nominal from pin 2 to 1; 200 ohms nominal from pin 3 to pin 1; RTS® and Clear-Com® compatible
    • Maximum DC output current: 250 milliamperes
    • Maximum Audio Output Level: +10 dBu
  • Voice Operated (VOX) Interrupt Function:
    • Input Source: audio from telephone interface 1, audio from telephone interface 2; or auxiliary audio input, selectable
    • Output: IFB channel 1 or 2, selectable
    • Detection Bandpass: 400 to 1400 Hz, nominal
    • Detect Time: <1 mSec
    • Release Time: 320 mSec, nominal
  • Telephone Interfaces 1 and 2:
    • Operating Modes: switch selectable for use with telephone lines or standard balanced or unbalanced audio signals
    • Receive Audio Level: –15 dBu, nominal, trim adjustable ±8 dB
    • Telephone Line Requirements: 2-wire, loop start, 10 milliamperes loop current minimum
    • Telephone Line Disconnect: manual, using front-panel switch; automatic, after detection of 250 mSec, nominal, break in loop current
    • Telephone Line Interface Control: switch on front panel allows manual answer (“off-hook”) and manual hang-up (“on-hook”) functions
  • Telephone Interface 2—Additional Features:
    • Auto Answer (when set for telephone line operation): configurable for 1, 2 or 4 rings or disabled
    • Audio Routing Control: switch on front panel allows Interface 2 to receive audio, or send IFB channel 1 or 2 audio
    • Send Audio Level: –6 dBu, nominal
  • Monitor Output:
    • Power: 4 watts RMS into 8 ohms @ 1% THD+Noise
    • Application: designed to drive loads of 8 ohms or greater
  • Access Station Interface: allows connection of up to four Model 22 or Model 24 Access Stations
  • AC Mains Input: 100-240 volts (–15/+10%), 50/60 Hz, 24 watts maximum
  • Dimensions (Overall): 19.0"(W) x 1.72"(D) x 9.2"(H)
  • Mounting: one space (1U) in a standard 19-inch rack
  • Weight: 4.5 pounds (2.1 kg)
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