ARX MSX 48 16 in, 48 Out ISO-Transformer MicrophoneLine Splitter

About the MSX 48

The ARX MSX 48 Transformer isolated Microphone/Line Splitter has been developed to deliver the performance required by the increasing complexity of today’s standards of audio production.

The MSX 48 is a totally passive device requiring no power, and consists of Sixteen channels of transformer isolated ultra low noise Microphone/Line Splitter. Each of these channels has a direct looped Main/FOH feed, and a transformer isolated Monitor split on the front panel.

On the rear panel is an Auxiliary transformer isolated split ideal for use with a remote recording truck or TV feed. Duplicates of the Monitor and Aux splits are also provided on two sets of dual 25 pin D connectors on the rear panel, wired to Tascam wiring protocol.


Numbered marker panels on the front and rear provide a space where individual channel connections can be noted.

The all-steel chassis of the MSX 48 provides strong interference resistant shielding. Internally, state-of-the-art transformers deliver superb audio quality and total galvanic isolation.

The MXS 48 is the easy answer to multi channel signal splitting requirements.



* Sixteen channel / three way split per channel

* Passive unit - no power required

* Ultra low noise design

* D sub connectors on rear panel for Monitor and Auxiliary Splits (Tascam wiring)

* Transformer Balanced Inputs and Outputs

* Inputs and Main Outputs hard wired to pass Phantom Power

* Intuitive, 'user friendly' layout

* Flawless audio performance


MSX48 Rear panel. Click on image to see larger version

Input Impedance 300 Ohms

Output Impedance 2 secondaries @ 600 Ohms each

Frequency Response 30Hz - 20 KHz ± 1dB

Maximum Output Level + 20dBm

THD at Max Output 0.2% 30 Hz - 20KHz @ 20dBm

Insertion Loss 0.5dB @ 1 KHz (600 Ohm source & load)

Input Connectors 3 pin female XLR wired Pin 2 + Hot, Pin 3 – Cold

Main Output 3 Pin male XLR wired Pin 2 + Hot, Pin 3 – Cold

Monitor & Aux Output 3 pin male XLR wired Pin 2 + Hot, Pin 3 – Cold. Audio grounds not connected; Pin 1 is floating.

Weight 13.5 lbs (6 Kg)


Rear Panel detail


Front Panel

  • 16 x Hardwired balanced XLR Input and Main Outputs. Pin 3–-, Pin 2 +, Pin 1 Ground
  • 16 x Hardwired transformer isolated balanced XLR Monitor Splits. Pin 3–-, Pin 2 +, Pin 1 floating (not connected)
  • Numbered marker panel for labelling individual channel assigns

Rear Panel

  • 16 x Hardwired transformer isolated balanced XLR Auxiliary Splits. Pin 3–-, Pin 2 +, Pin 1 floating (not connected)
  • 2 x D Sub connectors for Monitor Splits
  • 2 x D Sub connectors for Auxiliary Splits
  • Screw Terminal Chassis Ground point

Note: No connections to Audio ground