Studio Technologies 2A 2015 - Manual (Page 33)

Model 2A User Guide Issue 2, March 2015
Studio Technologies, Inc. Page 33
Specifications
Model 2A Central Controller
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 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 unbal-
anced 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