Studio Technologies MODEL 46A Dual 2-Wire Analog Audio to 4-Wire Analog Audio Interface

Studio Technologies MODEL 46A Dual 2-Wire Analog Audio to 4-Wire Analog Audio Interface The Studio-Tech 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. 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 Technical Specifications General Audio Frequency Response ±2 dB 100 Hz to 8 kHz Distortion (THD+N) <0.5%, measured at 1 kHz, 4-wire input to 2-wire interface pin 2 Signal-to-Noise Ratio >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 >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 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)