Studio Technologies Model 2A, 2-channel IFB Central Controller

Studio Technologies Model 2A, 2-channel IFB Central Controller

The IFB Plus Series Model 2A Central Controller from Studio Technologies is a highly integrated, 2-channel IFB (interruptible foldback) unit. It is the main component of the IFB Plus Series which is expressly designed to provide talent cueing for ENG, SNG, OB, and mobile production facilities. It can also find use in fixed installations that need a compact but feature-rich stand-alone IFB system. The performance and features of the Model 2A, along with its companion accessories, reflect the needs of contemporary applications. Only after extensive polling of field production and engineering personnel was the Model 2A's feature group established. We think you'll find it to be a great addition to your facility.

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 V, 50/60 hertz is connected via a detachable mains cord and provides power for the Model 2A.

General Audio Parameters (Program Input to Main Output):

• 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: ¼-inch, 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 Vdc 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 mA
• Maximum Audio Output Level: +10 dBu

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 mA 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

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 V (–15/+10%), 50/60 Hz, 24 watts maximum

Dimensions (Overall):

• 19.0 inches wide (48.3 cm)
• 1.72 inches high (4.4 cm)
• 9.2 inches deep (23.4 cm)