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Flexa MPI400 - Quick Install Guide

The scope of this document is to give a thorough introduction on the Flexa MPI400. At the end of this guide the user will be able to run a basic setup.

Flexa MPI400 runs the Flexa software. Refer to the Flexa user manual for a complete explanation on the software functionalities.

Package Content
  • MPI400 device (including screw terminal blocks)

  • Quick Install Guide

The Barix Flexa MPI400 is an audio over IP decoder, PoE or externally powered, offering a multitude of interfaces:

  • 1x 10/100 MB Ethernet with PoE support (IEEE 802.3af)

  • 1x 24VDC power input

  • 1x Audio output connection that can drive: 1w@8ohm speaker OR a line level balanced input

  • 1x 18V Phantom power microphone Input

  • 1x 2.7V Microphone input

  • 1x Unbalanced line level Input

  • 2x Digital inputs (dry contact)

  • 1x Normally closed relay (HW jumper configurable)

  • 1x Normally opened relay (HW jumper configurable)

  • 2x USB Type A

  • 1x Headphone out on 3.5mm trs


STEP 1 Connect the Audio Equipment

The Flexa MPI400 provides audio output on one of these connections: headphone, speaker / line.

STEP 2 Connect the network

Connect your Flexa MPI400 to the network using a standard Ethernet cable (CAT5e or better). Flexa MPI400 supports the PoE standard. If a PoE switch is not available consider to use a 24V external power supply.

STEP 3 Power up

At boot the device will

  • Light up status LEDs, both red (boot in process)

  • 15s after power up → Device announces its IP Address (take note to be able to enter the web interface later) → Left LED turns from red to green

  • 35s after power up → Application is ready → Right LED turns from red to green

Flexa MPI400 is ready to be used.

Hardware functionality

Front View

Rear View

2x USB

Type A USB Ports

RESET button

Short press while powered (1s - 9s) → Reboots the device

Long press while powered (10s - 19s) → Hard reset to defaults (including network settings)

Press and hold for 30s while powering up → Rescue process triggered: device will connect to the Barix update server and install the latest firmware


3.5mm trs headphone output

10/100 ETH

Fast Ethernet network connection on RJ45

LEDs (see table below)

As per picture above:

  • Left LED: System LED - Indicates low level system operations

  • Right LED: Application LED - Indicates application functions


2 ways detachable screw terminal block 24VDC Input - 12W max. consumption

Out Sp/Ln

3 ways detachable screw terminal block. Capable of driving both speaker level and line level inputs.

  • Speaker (only ‘+' and '-’): 1W @ 8Ohms

  • Balanced Line Level ('+','-' and 'G'): output


5 ways detachable screw terminal block (pins 1 -3 from left to right “+”,”-”,”G”)

Balanced 18V Phantom Microphone Input


5 ways detachable screw terminal block (pins 3 -4 from left to right, “G”,”L”)

Unbalanced Line Level Input


5 ways detachable screw terminal block (pins 3 -5 from left to right, “G”,”M”)

Unbalanced 2.1V bias Microphone Input


2x Digital Inputs (dry contact)


1x Normally Open Relay, 30V 0.5A

1x Normally Closed Relay, 30V 0.5A


Status LEDs description

Left LED

Left LED

Right LED

Right LED


System not powered





System booting



LED1 blinks slowly during the boot up process

System in Rescue mode



As soon as device enters rescue mode, LED1 starts blinking YELLOW

Factory defaults setting (RESET button pressed >10s)




After 10s of holding RESET button pressed, LED1 starts blinking fast GREEN to indicate that the RESET button can be released and that the default factory settings will be applied (incl. Network settings)

System ready


(see lines below)

(see lines below)

Check the descriptions below to see how the LEDs are supposed to behave once the system is “ready”

Application not running



Application running



Downloading / Installing Firmware



For more details on Flexa, the software running on Flexa MPI400 consult the Flexa user manual.

Compliance and further Information

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.

  • Increase the separation between the equipment and receiver.

  • Connect the device into an outlet on a circuit different from that to which the receiver is connected.

  • Consult the dealer or an experienced radio/TV technician for help.

Safety and precaution recommendations apply. Find them in the download section at

Find your distributor on this list for more hardware.

For questions that are extending the documentation, feel free to contact us on:

International: +41 434 33 22 22
USA: +1 866 815 0866

All information and the use of this product including all services are covered under the Barix Terms & Conditions and our Privacy Policy. Please follow the Safety and Precaution Recommendations. Barix is a ISO 9001:2015 certified company. All rights reserved. All information is subject to change without notice. All mentioned trademarks belong to their respective owners and are used for reference only.

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