PI-RJ2X Pro Audio to CAT converter

Pro Audio to CAT converter

  • Stereo audio isolation transformers for XLR inputs using CAT-5/6 cable
  • Lets you run cables to 100 meters (350’) without loss
  • Ruler-flat frequency response from 5 Hz to 20 kHz
  • Superior noise rejection from ground loops & magnetic fields over passive 'baluns'

Sold as a ‘transmit and receive’ set, the design begins with two rugged flanged steel enclosures for easy mounting under a desk or inside a rack or NEMA enclosure. Each end is equipped with XLR inputs and outputs, with a standard Ethernet RJ45 type connectors in between. One merely connects the source and destination devices using the XLR’s and bridges the two units using off the shelf CAT-5 or CAT-6 cable. This enables the system designer to employ pre-wired network cable to run analog audio throughout a facility without having to fish new wires. Note that the PI-RJ2X provides a ground connection for shielded CAT cable.

Plug and play easy to use, this passive interface does not require any power to work. Inside the receive module are two Jensen high performance transformers that are able to withstand signal levels to +19 dBu at 20 Hz without any discernible distortion. These provide galvanic isolation between the input and output to eliminate hum and buzz caused by ground loops, rejecting noise by as much as 124 dB. Once installed, the PI-RJ2R will quietly go to work, without introducing distortion, phase shift or artifacts of any kind.

Applications

Send balanced audio signals over long distances

The PI-RJ2X allows you to send balanced audio signals over long distances using standard CAT-5 or CAT-6 twisted pair ethernet cable. Connect the stereo output from your pro audio device to the XLR inputs on the PI-RJ2X transmitter, then use a CAT-5 cable to connect to the PI-RJ2X receiver. The PI-RJ2X will receive the audio signals without distortion or artifact.

Specifications

-T and -R units connected by 15 m (50’) CAT-5 cable, source = 600 Ω, Load = 22 kΩ unless noted

PARAMETER CONDITIONS MINIMUM TYPICAL MAXIMUM
Input impedance, Zi 1 kHz, -10 dBV   22 kΩ  
Voltage gain 1 kHz, -10 dBV -2.0 dB -1.65 dB -1 dB
Magnitude response, ref 1 kHz 20 Hz, -10 dBV -0.15 dB -0.03 dB ±0.0 dB
Magnitude response, ref 1 kHz 20 kHz, -10 dBV -0.35 dB -0.20 dB ±0.0 dB
Deviation from linear phase (DLP) 20 Hz to 20 kHz, -10 dBV   +1.4/-0° ±2.0°
Distortion (THD) 1 kHz, +2 dBV   <0.001%  
Distortion (THD) 20 Hz, +2 dBV   0.04% 0.10%
Maximum 20 Hz input level 1% THD +14 dBV +17 dBV  
Common – mode rejection ratio (CMRR) 60 Hz   115 dB  
Common – mode rejection ratio (CMRR) 3 kHz 80 dB 90 dB  
Output impedance, Zo 1 kHz   5.3 kΩ  
Cable length effect on 20 kHz response in dB (cable at 15 pF per foot) 8 m (25’) / 375 pF   0 dB  
Cable length effect on 20 kHz response in dB (cable at 15 pF per foot) 15 m (50’) / 750 pF   0 dB  
Cable length effect on 20 kHz response in dB (cable at 15 pF per foot) 30 m (100’) / 1.5 nF   -0.2 dB  
Cable length effect on 20 kHz response in dB (cable at 15 pF per foot) 80 m (250’) / 3.75 nF   -1.0 dB  
Cable length effect on 20 kHz response in dB (cable at 15 pF per foot) 100 m (350’) / 5.25 nF   -1.7 dB  
Temperature range operation or storage 0°C   70°C
Breakdown voltage* transmitter to receiver ground references, 60 Hz, 1 minute test duration 250 V RMS    

Graphs

Phase Distortion (DLP)
Frequency Response
THD vs Level at Low Frequencies
THD vs Frequency at Various Levels

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