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Studio Technologies Model 46A Dual 2-Wire Analog Audio to 4-Wire Analog Audio Interface
The Model 46A is designed to interface 2-wire full-duplex party-line (PL) intercom circuits with 4-wire audio circuits associated with matrix intercom systems. Other specialized audio system interfacing applications can also be supported. The Model 46A provides two independent full-featured 2-channel interfaces. Each interface contains two hybrid circuits which include automatic nulling capability. The analog circuitry, under software control, provides excellent audio quality and high return-loss. The interfaces are compatible with powered and unpowered 2-wire party-line circuits. They are capable of supplying DC power, allowing direct operation of devices such as user beltpacks. Configuration settings allow the 2-wire and 4-wire interface circuitry to be compatible with a range of nominal signal levels. Audio level meters provide user confirmation of system performance during setup and operation. Applications for the Model 46A include television sports and special event broadcasting, theme park and theater installations, corporate events, and industrial testing environments. Standard audio connectors are used for all input and output signals. The Model 46A mounts in one space of a standard 19-inch rack enclosure and requires 100-240 V, 50/60 Hz for operation.
Key Features
Two 2-channel party-line intercom interfaces
Four analog hybrids with auto null capability
Input and output level metering
Excellent audio quality
Integrated intercom power sources
Standard audio connectors
Transformer-coupled 4-wire inputs and outputs
Universal input mains powered
| General Audio: Frequency Response: ±2 dB 100 Hz to 8 kHz Distortion (THD+N): less than 0.5%, measured at 1 kHz, 4-wire input to 2-wire interface pin 2 Signal-to-Noise Ratio: greater than 55 dB, measured at 1 kHz, 4-wire input to 2-wire interface pin 2 Connectors: Inputs from 4-Wire: 3-pin female XLR Outputs to 4-Wire: 3-pin male XLR 2-Wire Party-Line Intercom: 3-pin male XLR Remote Control: 10-pin header, requires optional 10-pin ribbon connector assembly AC Mains: 3-blade, IEC 320 C14 (mates with IEC 320 C13) 2-Wire Party-Line Intercom Interfaces: 2 Type: 2-channel party-line (PL), unbalanced (pin 1 common; pin 2 channel 1 audio or DC with channel 1 audio; pin 3 channel 2 audio) Compatibility: single- and 2-channel intercom systems such as from RTS® and Clear-Com® Impedance, External Power Mode: >10 k ohms Impedance, Internal Power Mode: 200 ohms Nominal Level: –10 or –14 dBu, selectable "Mic Kill" Signal: square wave, 24 kHz, ±1% Internal Power Source: 30 Vdc nominal, 315 mA maximum Hybrids: 4, 2 per interface Topology: 3-section analog circuitry compensates for resistive, inductive, and capacitive 2-wire party-line loads Nulling Method: automatic upon user initiation, processor implements digital control of analog circuitry; null settings stored in non-volatile memory Nulling Line Impedance Range: 120-350 ohms Nulling Cable Length Range: 0-3500 feet, typical Trans-Hybrid Loss: greater than 40 dB, typical at 800 Hz | 4-Wire Inputs: 4, 2 per interface Type: transformer-coupled, capacitor isolated Impedance: 13 k ohms Nominal Level: 0, +4, +6, or +8 dBu, selectable in tandem with nominal output level Maximum Level: +22 dBu 4-Wire Outputs: 4, 2 per interface Type: transformer-coupled, capacitor isolated Impedance: 50 ohms nominal Nominal Level: 0, +4, +6, or +8 dBu, selectable in tandem with nominal input level Maximum Level: +20 dBu into 2 k ohms Meters: 8 Function: displays level of 4-wire inputs and outputs Type: 5-segment LED, modified VU ballistics Remote Control Inputs: 3 Type: optically coupled Input: 3-32 Vdc; 2 mA minimum for operation, 20 mA maximum Functions: auto null interface 1, auto null interface 2, and "mic kill" AC Mains Requirements: 100-240 V (–15/+10%), 50/60 Hz, 34 watts maximum Dimensions (Overall): 19.0 inches wide (48.3 cm) 1.72 inches high (4.4 cm) 8.4 inches deep (21.3 cm) Mounting: one space (1U) in a standard 19-inch rack Weight: 4.6 pounds (2.1 kg) Specifications subject to change without notice. |