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Description
Williams AV FM T55C FM+ C Assistive Listening SystemFM+ C is the first transmitter of its kind to offer an FM broadcast and Wi Fi audio broadcast from a single input source. Whether using the FM+ C for assistive listening, language interpretation, or audio description, this dual broadcast technology gives users the option of listening to real time audio stream on their smartphone or tablet using the free WaveCAST receiver app (iOS and Android) or use an available FM receiver from the venue. The FM+ C
FM+ C is the first transmitter of its kind to offer an FM broadcast and Wi-Fi audio broadcast from a single input source. Whether using the FM+ C for assistive listening, language interpretation, or audio description, this “dual broadcast” technology gives users the option of listening to real-time audio stream on their smartphone or tablet using the free WaveCAST receiver app (iOS and Android) or use an available FM receiver from the venue.
The FM+ C has support for Telnet commands via an Ethernet port enabling AV professionals to control and monitor the FM+ C using third-party room control systems.
Specifications
| 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 | |||
| Rack Mount | Standard 19” Rack, one EIA rack space high, 1/2 space wide 1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits |
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| Power Supply | Desktop Style Transformer (TFP 062); Input: 100-240 VAC, 50/60 Hz. IEC Line Cord; Output: 24 VDC, 750 mA, 18W. 2.5mm ID center positive barrel connector | |||
| Power ON Indicator | Push On/Push Off latching power button with backlight. Green backlight indicates power ON, backlight off indicates power OFF. | |||
| Temperature Range | Operating: +32° F to +122° F (0° C to 50° C); Storage: -4° F to +158° F (-20° C to 70° C) | |||
| User Interface | 1. 3.12” High Resolution OLED display with selections via buttons. 2. Hosted Web page. 3. Telnet commands over ethernet (see our WaveCAST and FM+ Programmers Guide” for available commands and protocol). | |||
| Dante | (1x) RJ-45 jack. Only available on FM T55C D | |||
| 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 compliant, unique MAC address. RJ-45 jack used for web page and streaming audio out. An external Router/DHCP Server is required to stream audio to receiving devices. | |||
| 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 microsec | |||
| RF Field Strength | Does not exceed 80 mV/m at 3 m | |||
| Compatible Antennas | ANT 005, ANT 021, ANT 024, ANT 025, ANT 028, ANT 029, ANT 034
Refer to Williams AV’s Antenna Selection Install Guide for FCC-compliant antennas for this product. |
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| Transmission Range | Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis F-connector | |||
| RF Outputs | (1x) #10-32 stud connector in center of unit (pcb mounted) (1x) F-connector on rear chassis |
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| RF Transmit (RF) Power Indicator | 1 OLED On Air Indicator with 4 states indicating power level Off, Low, Medium, and Full Power. | |||
| RF Time Out (sleep mode) | 30 min. duration, 4 hr. duration, or Always On; selected via web page. When audio drops below -18dB, the selected duration begins, and when it expires the unit stops transmitting and goes into a low-power (“sleep”) mode. Any button press or resumption of audio above -18dB “awakens” the unit and it begins transmitting again. | |||
| Audio Section | ||||
| Audio Inputs | (1x) Combination 3-pin XLR, 1/4” (TRS) jack for balanced or unbalanced line level, or balanced or unbalanced microphone with selectable phantom power. Optional RJ-45 Dante Input (“D” models only). | |||
| Audio Processor Functions | DSP based; Compression: 1:1, 1.5:1 or 2:1; High-pass and Low-pass Filter Frequency control, Music, Voice, and Hearing Assistance Audio Presets | |||
| Frequency Response | 31-16000 Hz, ±3 dB (re: 1 kHz) (“Music” Audio Preset) | |||
| Signal-to-Noise Ratio | 64 dB (typical) Transmitted RF @ 1kHz | |||
| Total Harmonic Distortion | Less than 0.25% @ 1 kHz (RF output) | |||
| Common Mode Rejection | Greater than 57 dB @ 1 kHz, Mic or Line mode | |||
| Audio Input Gain Adjust | Adjustable from +24dB to -60 dB, in 1dB steps from front screen or web page | |||
| Phantom Power | 14.4 VDC applied through 2.2 kOhms resistors to analog combo jack: Pin 2 and Pin 3 on XLR jack, or tip and ring on 1/4″ TRS jack | |||
| Audio Level Display | Front screen bar graph display, each segment representing 3dB. It ranges from -18 (1 segment lit) to +12dB (10 segments lit). Over-range warning is indicated by ‘OLVD’ and flashing empty bar. | |||
| Headphone Output | 1/4″ TRS stereo jack, mono signal, 7.8 mW total power with 33 Ω. | |||
| Dante Output | (1x) RJ-45 jack, only available on FM T55C D | |||
| Input Level (Bal or Unbal) (at Audio Input Gain = 0dB) |
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| Approvals | FCC, RoHS3, WEEE, Industry Canada | |||
| Warranty | 2-year warranty against component failure and manufacturing defects. See the Full Warranty statement on the website for details.* Stresses above these ratings may cause permanent damage or degrade reliability. | |||
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
would buy again
Size: King, Color: Teal
very soft, washed well so far, no pilling noticed. Fits my 18-inch mattress well. Overall, very nice
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Soft, comfortable and cool.
Size: Queen, Color: Teal
Love these jersey sheets
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026
★★★★★ 5
Great sheet set
Size: Queen, Color: Purple
Wonderful sheet set, soft and well made!!!
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Reviewed in the United States on April 22, 2026
★★★★★ 4
Warm But Pills
Size: Full, Color: Purple
Overall the Intel Design jersey knit bed sheets are just like sleeping between a huge cotton blend t-shirt. It's soft, cozy, and warm to the touch. However after only two washings, the fabric begins to pill significantly and a lot of lint collects in the clothes dryer's lint trap. The new sheets now look five years old and stratches the skin. The warmth does provide longer periods of restful sleep. Not sure how long the fabric will last, as it appears a bit tired and worn. The initial purple color also appears noticeably duller. Good value at first, but probably will replace in a few months, so not much savings in the long run
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Reviewed in the United States on January 24, 2026
★★★★★ 5
Love these
Size: Full, Color: Purple
I purchased these for my guest bedrooms, but I will be buying them for my room too. They're so comfy. The color is nice and fit perfect on the bed.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026