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FM +

FM T55

QUICK START GUIDE

Wi-Fi Network Required

If Wi-Fi audio is desired, the FM + connects to the installation 

location's Wi-Fi Network. It does not provide a network on its own. 

The Wi-Fi network will need to be installed and established before 

the FM + can be used.
You may connect the device to a computer via a hardwired 

connection to help troubleshoot any networking problems.
A Wi-Fi network is not required for broadcasting audio over FM.

Installation Procedures

1.  Position the FM + transmitter near the sound system or mixer 

from which it will receive audio. We do not recommend wall or 

ceiling mounting, or putting the device on a cart.

2.  Connect the power supply to the Power Supply connector 

located on the back of the FM +. Press in the power button on 

the front of the FM +. The power button should light up. If not, 

go back and check the power connections.

3.  Choose and configure the audio source. 

CAUTION!

 This source 

must be configured in the menu

 

before plugging the source into the jack. Voltage sent to the jack 

based on the source selected in the menu. Selecting the wrong 

configuration could send the wrong voltage to the source and 

cause damage. 

The audio source must be configured in the menu before 

plugging the source into the jack (except Dante Audio - skip 

to step 9)

. Push the Menu button and push the right arrow button 

once to display AUDIO SOURCE on the screen. Push the right 

arrow button to access the audio sources. Using the up or down 

arrow buttons, choose between ANALOG LINE IN, MIC, PHANTOM 

MIC +12V, 400 Hz Test Tone, or DANTE. When the desired audio 

source is displayed, press the right arrow button to apply the 

setting. Press the center Menu button to exit the menu. 

4.  Push the power button to turn the unit off.
5.  Connect the audio source to the audio input jack on the rear 

of the FM +.

6.  Push the power button to turn the unit on.
7.  With the audio source playing, adjust the Audio Level on the 

FM + so that the green 0 dB LED generally lights and the red 

+9 dB LED lights occasionally. To do this, use the Hot Buttons 

while on the main info screen. Press the up arrow button to 

increase the audio level in 1.0 dB steps, or press the down 

arrow button to decrease the audio level in 1.0 dB steps.

8.  Select an Audio Preset. The FM + has three pre-configured 

Audio Presets to choose from: Hearing Assist, Music, and 

Voice. A Custom preset is also available. The performance of 

the FM + is optimized for each of the pre-configured Audio 

Presets.  

Using the menu and control buttons on the front of the FM +, 

push the Menu button, the display will change to show Audio 

Settings. Use the right arrow button to display Audio Source in 

the selection box. Push the down arrow button to show Audio 

Presets. Now press the right arrow button to display the list 

of Presets. Use the up and down arrow buttons to alternate 

between Hearing Assist, Music, Voice and Custom selections.  

When the desired Audio Preset is displayed, press the right 

arrow button to apply the setting. If Custom is desired, push 

the right arrow button to enter the custom settings. Press the 

Menu button to exit the menu.

0.75A

Streaming Audio Out

Ethernet

RoHS

Made in USA

Analog

Audio

Line Out

Line / Mic In

phantom

bal

unbal

24VDC

RF75Ω Ant

Back Panel Diagram

© 2022, Williams AV, LLC   MAN 246D

FM

+

– 18

– 15

– 12

– 9

– 6

– 3

0 dB

+ 3

+ 6

+ 9

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