Input module for digital and analog audio

Analog RCA and digital TOSLINK to balanced analog audio. The module could be powered over the bus, or if connected directly to a power supply, it adds both power and audio to the EAS-bus.

The EAS-TX-DA converts digital audio (TOSLINK) or unbalanced analog audio (RCA) to balanced analog audio and sends it over the EAS-bus.

  • It also has an input for a 15-volt power supply. If connected, it will both power the module itself and be the power source for the rest of the bus.
  • The unit can also be bus powered, if a powersource is provided elsewhere along the bus.
  • Gain levels can be set using a dipswitch.
  • It’s got a 0-volt trigger to instantly mute all outgoing audio by simply shorting the Phoenix-connector pins.

Technical Specifications

Operating voltage:
15 (12 - 16) VDC
  • Analog audio (RCA)
  • EAS-bus (RJ45) x2
Frequency Response:
20 - 22 000 Hz


Operating Temperature:
0° - 50° C (32° - 122° F)
Operating Humidity:
10% - 85%, Non-condensing
Storage Temperature:
-40° - 70° C (-40° - 158° F)
Storage Humidity:
10% - 85%, Non-condensing

Regulatory Approvals

  • EN 55032:2012
  • EN 55103-2:2009
  • IEC 60533:2015
  • IEC/EN 60945:2002 + Cor1:2008 /EMC requirements only

IEC/EN 60065: 2014


EN 50581:2012


Limited Warranty 1 Year Parts and Labor

Manufactured by

Laud Media AS, Løkka 7, N-3271 Larvik, Norway

Data is subject to change without notice.

Quick Start Guide

The EAS-TX-DA is typically used in one of two ways:

  1. If an EAS-SYSCON-12 is involved, it can be one of many input modules to get audio into the large system.
  2. If it’s a system with only one bus, this is typically where it all begins.

Looking at the illustration above, you’ll see that both power and audio gets connected to the EAS-TX-DA, for it all to melt together into one EAS-bus. You don’t have to connect a power supply, but then a power source needs to be provided elsewhere alone the same EAS-bus.

From here, the EAS-bus has everything it needs, so this unit alone with an amplifier and some speakers can be a system by themselves.

The module is expecting line-level signals. If the incoming signal is on the low side, you might want to consider gaining it up a bit. Use the following dipswitch settings to obtain the desired level of boost:

To utilize the 0-volt instant mute trigger, it’s a simple matter or shorting the two pins inside the Phoenix connector. There should be corresponding 0-volt interfaces on the 3rd party fire alarm system, so it will be a basic one-to-one connection between the Phoenix connector and the alarm unit.


  1. EAS-BUS Output 1
  2. EAS-BUS Output 2
  3. Gain switch
  4. RCA analog audio input right
  5. Power LED / Peak
  6. Power supply +/- 15VDC
  7. 0 volt mute trigger
  8. Service MCU
  9. RCA analog audio input left
  10. Toslink input