Studio Technologies Model 41 Interface with 4 Independent IFB Circuits

Studio Technologies Model 41 Interface with 4 Independent IFB Circuits The Studio Technologies Model 41 is designed to create broadcast-standard IFB outputs from line-level audio sources. The unit's primary application is to interface analog outputs associated with digital matrix intercom systems with broadcast IFB user devices. The Model 41 creates four independent IFB outputs. Each IFB output provides DC power and two analog audio signals to support the connected IFB user devices. The Model 41's audio quality is excellent; little hiss, hum, or other artifacts are present. To ensure optimal operation, the unit provides resources for visually and audibly monitoring the audio output signals. In addition, the DC output voltage is monitored for fault conditions. Key Features Transformer-coupled inputs Excellent audio quality Superior power-feed performance Four independent IFB circuits Single rack-space mounting Universal mains input powering Technical Specifications General Audio Frequency Response - Pin 2 Output (DC with Channel 1 Audio) +0/-3 dB, 20 Hz-20 kHz; +0/-1 dB, 100 Hz-20 kHz Frequency Response - Pin 3 Output (Channel 2 Audio) +0/-3 dB, 20 Hz-20 kHz; +0/-1 dB, 100 Hz-20 kHz Distortion (THD+N) - Pin 2 Output (DC with Channel 1 Audio) 0.05%, measured at 1 kHz, +4 dBu S/N Ratio - Pin 2 Output (DC with Channel 1 Audio) 86 dB, ref +4 dBu out, A-weighted Audio Inputs 8, organized as four 2-channel inputs Type transformer balanced, capacitor coupled, compatible with balanced or unbalanced sources Impedance 10 k ohms, nominal Nominal Level +4 dBu IFB Circuits 4 Type DC power with two channels of unbalanced audio (“wet” IFB) Connections Pin 1 common Pin 2 30 Vdc (nominal) modulated with channel 1 audio (-10 dBu nominal) Pin 3 channel 2 audio (-10 dBu nominal) Maximum Audio Output Level Pin 2 +9 dBu with +23 dBu on audio input Pin 3 +14 dBu with +28 dBu on audio input DC Current Output 220 mA maximum Monitor Section - Headphone Output Type 2-channel (stereo), drives headphones by way of 100-ohm series resistors Compatibility intended for connection to headphones with impedance of 100 ohms or greater Maximum Voltage 8 Vpp, 100-ohm load Monitor Section - Output Voltage Detection Measures DC voltage level directly on pin 2 of IFB output connectors. Status LEDs flash when level is less than approximately 24 Vdc. Connectors Audio Inputs 25-pin female D-subminiature, 4-40 threads on locking hardware (two places) IFB Outputs 3-pin male XLR Headphone Output 1/4-inch 3-conductor phone jack AC Mains 3-blade, IEC 320 C14 (mates with IEC 320 C13 connector) AC Mains Requirement 100-240 V (±10%), 50/60 Hz, 40 watts maximum