Williams Sound FM T55 Specifications

SPECIFICATION DATA

FM +

FM T55

The new FM+ integrates professional WaveCAST Wi-Fi audio server technology into a Williams Sound FM assistive listening system.
End users can now listen with either an FM receiver or with their own smartphone (via the WaveCAST Listening App). Venues no
longer need to choose between providing FM or Wi-Fi assistive listening systems. Along with this flexibility comes exceptional audio
quality, as the FM+ is built on a professional digital audio (DSP) platform.

FM +

Dimensions 8.45” W x 8.25” D x 1.72”H (21.5 cm x 21 cm x 4.4 cm)

Weight Transmitter: 3.2 lbs (1.45 kg)

Color Black/Silver with silver legends on the front, white legends on the back

Rack Mount Standard 19” Rack, one EIA rack space high, 1/2 space wide

Power Supply Desktop Style Transformer (TFP 062); Input: 100-240 VAC, 50/60 Hz. IEC Line Cord; Output: 24 VDC, 750 mA, 18W.

Power ON Indicator Push On/Push O latching power button, backlit green indicates power ON, backlight o indicates power OFF,

Temperature Range Operating: +32° F to +104° F (0° C to 40° C); Storage: -4° F to +158° F (-20° C to 70° C)

Ethernet RJ-45 on back of unit supports CAT 5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3

Dante Only available on FM T55 D

User Interface 3.12” High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring.

RF Section

Operating Frequencies 72.1-75.9 MHz , 17 wideband channels (selectable)

Frequency Accuracy ± 2 ppm stability, 0-50˚ C

Deviation ± 75 kHz maximum

Pre-Emphasis 75 µsec

RF Field Strength Does not exceed 80 mV/m at 3 m

Compatible Antennas ANT 005, ANT 021, ANT 024, or ANT 025

1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount
Kits

2.5mm ID center positive barrel connector

fading from bright to dark indicates Sleep Mode.

compliant, unique MAC address

© 2019, Williams AV, LLC MCAT 262A

SPECIFICATION DATA

Transmission Range Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector

RF Outputs (1x) #10-32 stud connector in center of unit (pcb mounted)

RF Transmit Indicator 1 Green LED On Air Indicator

RF Power Full, Medium, Low or OFF indiacted by menu icon.

RF Time Out (sleep mode) 30 min. duration, 4 hr. duration, or Always On selected via menu. Starts when audio is below -18 dB level with no

Audio Section

Audio Processor Functions DSP based; Compression: 1:1, 1.5:1 or 2:1; High-pass and Low-pass Filter Frequency control,

Frequency Response 31-16000 Hz, ±3 dB (re: 1 kHz, ±3 dB) (“Music” Audio Preset)

Signal-to-Noise Ratio 67 dB (typical) Transmited RF

Total Harmonic Distortion Less than 0.25% @ 1 kHz (RF output)

Common Mode Rejection >57 dB @ 1 kHz, Mic or Line

Audio Inputs (1x) Combination 3-pin XLR, 1/4” (TRS) jack for balanced or unbalanced line level, or balanced or unbalanced

Audio Input Gain Adjust In menu, adjustable to 0 to -50 dB, in 1dB steps

Phantom Power 14.4 VDC applied through 2.2 kΩ resistors to analog combo jack: Pin 2 and Pin 3 on XLR jack, or tip and ring on

Audio Level Indicators 10-LED array that reads -18 to +9 dB at 3 dB intervals. 7 Green, 2 Amber, and 1 red LED. Green LEDs indicate

Headphone Output 1/4” TRS stereo jack, mono signal, 14.85 mW at +9 dB, maximum in 33 Ω (level adjustable in menu 0 to -40 dB in 2

Line Output RCA jack (black), -10 dBV (.32 VRMS); Output impedance 100 Ω at +9 dB

Input Levels (Bal or Unbal)

(at Audio Input Gain = 0dB)

Microphone -55 dBV (1.7 mV RMS) -22 dBV (80 mV RMS) +20 dBV (10.0 V RMS)

Approvals FCC, RoHS3, WEEE, Industry Canada

Warranty 2-year parts and labor

(1x) F-connector on rear chassis

button pressed for selected duration.

Music, Voice and Hearing Assistance Audio Presets

microphone with selectable phantom power

1/4” TRS jack

normal operating audio level peaks, Amber LEDS indicate close to overload peaks, Red LED indicates overload
peaks

dB steps)

Nominal (1st Amber LED) Overload Warning

(Displayed On Screen)

Line -25 dBV (55 mV RMS) +16 dBV (6.3 V RMS) +20 dBV (10.0 V RMS)

Absolute Max. Rating*

NOTE: Specifications are subject to change without notice.

* Stresses above these ratings may cause permanent damage or degrade reliability.