William Sound FM T55+ Quick Start Manual Download Page 1

FM +

FM T55

QUICK START GUIDE

Wi-Fi Network May Be 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. 

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 > button once to display 

AUDIO SOURCE on the screen. Push the > button to access the 

audio sources. Using the ^ or v menu 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 (>) to apply the setting. Press the 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 ^ button to 

increase the audio level in 1.0 dB steps, or press the v 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 forward > button to display 

Audio Source in the selection box. Push the down v button 

to show Audio Presets. Now press the right arrow > button to 

display the list of Presets. Use the ^ and v buttons to alternate 

between Hearing Assist, Music, Voice and Custom selections. 

When the desired Audio Preset is displayed, press the right 

arrow (>) 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.

9.  (FM + D only) Connect a CAT 5e Ethernet cable from the 

Dante network to the connector labelled Dante on the 

transmitter. (Note: Dante IP Address and other settings are 

configured externally through Dante Controller; there are 

no settings in the transmitter for Dante, other than choosing 

Dante as the input source).

10. If Dante audio is being used, the Dante source must be 

connected, must be playing audio, and the Dante Controller 

must be used to route audio from the Dante source to the FM +.

11.  Install an appropriate antenna for your system configuration. 

For a full list of antenna options, please go to our website 

www.williamsav.com. See the 72 MHz Antenna Selection 

Guide on the Williams AV website for further installation 

advice.

0.75A

Streaming Audio Out

Ethernet

RoHS

Made in USA

Analog

Audio

Line Out

Line / Mic In

phantom

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unbal

24VDC

RF75Ω Ant

Back Panel Diagram

© 2019, Williams AV LLC   MAN 246B

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