Model 2A Central Controller
General Audio Parametres (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
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: less than 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 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
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 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)
Mounting: one space (1U) in a standard 19-inch rack
Weight: 4.5 pounds (2.1 kg)