Assistive Listening : Assistive Listening Systems : Williams AV - FM 557-24

FM+ 557-24 System - 24 Receivers

Model: FM 557-24

System Includes:
(1) FM T55C transmitter
(24) PPA R37N receivers
(24) EAR 022 surround earphones
(6) NKL 001 neckloops

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FM+ 557-24: ADA-compliant assistive listening for mid to large-sized venues, ensuring clear, reliable, and accessible audio for all visitors.

At its core, the FM+ T55C transmitter delivers dual FM and Wi-Fi audio with DSP audio processing for high sound quality and intelligibility. It features an OLED display, intuitive navigation, and network control, seamlessly integrating with third-party room control systems for effortless management.

The system includes 24 R37 receivers with digitally synthesized audio for exceptional clarity and 24 surround earphones designed for comfort, resting outside the ear for a high-quality listening experience.

System Includes:
(1) FM T55C transmitter
(24) PPA R37N receivers
(24) EAR 022 surround earphones
(6) NKL 001 neckloops
(1) IDP 008 ADA wall plaque

Spec Sheet available - Yes

FM+ C:
•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, 1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits
•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, backlit green indicates power ON, backlight off indicates power OFF, fading from bright to dark indicates Sleep Mode.
•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: 3.12” High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring.
•Dante: 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
RF Section:
•Operating Frequencies: 72.1-75.9 MHz , 17 wideband channels (selectable)
•Frequency Accuracy: ± 2 ppm stability, 0-50 Degrees 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, or ANT 025
•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), (1x) F-connector on rear chassis
•RF Transmit Indicator: 1 Green LED On Air Indicator
•RF Power: Full, Medium, Low or OFF indiacted by menu icon
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% at 1 kHz (RF output)
•Common Mode Rejection: Greater than 57 dB at 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 microphone with selectable phantom power
•Audio Input Gain Adjust: In menu, adjustable to 0 to -50 dB, in 1dB steps
•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 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 normal operating audio level peaks, Amber LEDS indicate close to overload peaks, Red LED indicates overload peaks
•Headphone Output: 1/4" TRS stereo jack, mono signal, 14.85 mW at +9dB, maximum in 33 OHMS (level adjustable in menu 0 to -40 dB in 2 dB steps)
•Line Output: RCA jack (black), -10 dBV (.32 VRMS); Output impedance 100 ohms at +9dB
•Input Levels (Bal or Unbal) (at Audio Input Gain = 0dB): Nominal (1st Amber + 3dB LED): Overload Warning (Displayed on Screen): Absolute Max. Rating
•Microphone: -55 dBV (1.7 mV RMS): -22 dBV (80 mV RMS): +20 dBV (10.0 V RMS)
•Line: -25 dBV (55 mV RMS): +16 dBV (6.3 V RMS): +20 dBV (10.0 V RMS)
•Approvals: FCC, RoHS3, WEEE, Industry Canada
•Warranty: 2-year parts and labor
EAR 022:
•Style: Around-ear speaker
•Plug: 3.5mm mono
•Cord: 39"
•Driver Size: 23 mm
•Nominal Impedance: 32 OHMS
•Freq. Response: 20 - 20kHz
•Weight: 15g
•Max Power Input: 30 mW
•Sensitivity: 118 dB at 1kHz
IDP 008: 10-3/8" (L) x 6-¼" (W) x 1/8" (H)
NKL 001:
•Color: Black
•Weight: 1.5 oz
•Length: 18.5” cord
•Connector: NKL 001: 3.5 mm mono plug NKL 001-S: 3.5 mm stereo plug with ring disconnected
•Impedance: 8-16 Ohms
•Input Power: 500 mW max
•Magnetic Field Strength: 25 mW input at 1000 Hz produces 1.7 A/m 6” above the center of loop 85µW input produces 0.1 A/m (IEC Standard)
•Approvals: RoHS, WEEE
•Warranty: One Year
PPA R37:
•Dimensions: 4.1" x 2.85" x 1.38" (104 x 72 x 35mm)
•Weight: 4.6oz (130g) with batteries. 2.6oz (73g) without batteries
•Color: Black
•Battery Type: (2) AA Alkaline or 2 x AA NiMH
•Battery Life: Two (2) AA non-rechargeable alkaline batteries (BAT 001), approx. 50 hrs (2) AA rechargeable NiMH batteries (BAT 026), 1500 mAh, approx. 32 hrs
•Current Consumption: 52mA nominal
•Temperature Range: – 0 to 50C
•Channels: 17, accessed via seek button in battery compartment
•Operating Freq.: 72.1, 72.2, 72.3, 72.4, 72.5, 72.6, 72.7, 72.8, 72.9, 74.7, 75.3, 75.4, 75.5, 75.6, 75.7, 75.8, 75.9 MHz*
•Intermediate Freq.: 75 kHz
•FM Deviation: 75 kHz
•De-Emphasis: 75 uS
•LED Indicator: Power: Green; Low Battery: Flashes Green
•AFC Range: ± 120 kHz
•Sensitivity: 2 µV at 12 dB Sinad with squelch defeated
•Input Overload: 100 mV
•Frequency Response: 200 – 15 kHz
•Modulation: FM, +/- 75 kHz peak deviation
•Signal-to-Noise Ratio: 65 dB min at 100 uV
•Receive Antenna: Integral with earphone/headphone cord
•Audio Output: 35 mW max, peak into 16 ohms
•Output Connector: 3.5 mm stereo/mono phone jack
•Earphone: Earbud-type with foam cushion, 3.5 mm plug, 32 OHMS
•Auto Shut-off: Enters sleep mode after approx 6 mins of no RF signal
•Approvals: FCC, Industry Canada, RoHS, WEEE
•Warranty: Lifetime PLUS Limited Warranty, 90 Days on most accessories