Assistive Listening : Assistive Listening Systems : Williams AV - FM 558

FM+ 558 System, 4 Receivers

Model: FM 558

System Includes:
(1) FM T55C transmitter
(4) PPA R38N receivers
(4) EAR 022 surround earphones
(2) NKL 001 neckloops

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The FM+ 558 system is a turnkey assistive listening solution, combining an FM+ C transmitter and four R38 receivers for seamless FM and Wi-Fi audio streaming. Ideal for small venues seeking an ADA-compliant solution for clear and accessible audio.

At its core, the FM T55C dual FM and Wi-Fi broadcast transmitter is easy to install and cost-effective, delivering high sound quality with DSP audio processing. It features an intuitive OLED display and network control for seamless integration and management.

The R38 multi-channel receivers include an OLED screen for easy, on-screen channel selection of 17 pre-set wideband frequencies (72.1 – 75.9 MHz). The system is fully expandable to accommodate any number of listeners and meets 2010 ADA guidelines for hearing assistance. To support accessibility, the system includes an ADA wall plaque, helping venues promote their assistive listening system to visitors.

System Includes:
(1) FM T55C transmitter
(4) PPA R38N receivers
(4) EAR 022 surround earphones
(2) 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 R38N:
•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/Silver. Black ABS Plastic case with Aluminum faceplate.
•Battery Type: (2) AA Alkaline or (2) AA NiMH Rechargeable
•Battery Life: (2) AA non-rechargeable alkaline batteries (BAT 001-2), approx. 50 hrs. (2) AA rechargeable NiMH batteries (BAT 026-2), 1500mAh, approx. 32 hrs.
•Current Consumption: 52mA nominal
•Operating Temp. Range: 32° – 122°F (0° to 50°C)
•Channels: 17 Wideband, accessed via menu
•Operating Frequencies: 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
•FM Deviation: 75 kHz
•De-Emphasis: 75 uS
•Display Screen: 1" OLED
•Power Indication: Power button, backlit green. Good battery strength - glows solid. Low battery - flashes.
•Sensitivity: 2 uV at 12 dB Sinad with squelch defeated
•Input Overload: 100 mV
•Frequency Response: 200 Hz – 15 kHz, ±3dB
•Modulation: FM, +/- 75 kHz peak deviation
•Signal-to-Noise Ratio: Minimum 65 dB at 1.0V
•Receive Antenna: Integral with earphone/headphone cord
•Audio Output: 35 mW max at 16 ohms
•Headphone Connector: 3.5 mm stereo jack, mono output for stereo or mono earphones/headphones
•Supplied Earphone: Stereo,earbud-type with foam cushion, 3.5 mm plug, 32 OHMS
•Power Save Mode: Enters sleep mode after approximately 3 minutes of no RF signal
•Approvals: FCC, Industry Canada, RoHS, WEEE
•Warranty: Lifetime PLUS Limited Warranty, 90 Days on most accessories

EAR 022 - Surround Earphone

PPA R38N - PPA R38 FM Receiver

MCAT-294D-822-FM-558-Cutsheet.pdf 519743 kb - Data Sheet

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MAN-245I-822-FM-T55-Manual.pdf 480264 kb - Instructions

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