Assistive Listening : Assistive Listening Systems : Williams AV - FM 558-24 PRO

FM+ 558-24 PRO System - 24 Receivers

The FM+ 558-24 PRO System is a powerful assistive listening solution for large venues, designed for seamless installation with professional accessories.

Model: FM 558-24 PRO

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

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The FM+ 558-24 PRO System is a powerful assistive listening solution for large venues, designed for seamless installation with professional accessories.

The system includes the FM+ C, a dual FM and Wi-Fi audio transmitter, with DSP audio processing for high sound quality and the ability to be managed by third-party room controls. Listeners can tune into the Wi-Fi broadcast using the WaveCAST app on their mobile devices or use one of the 24 included R38 handheld receivers, featuring an OLED screen for effortless tuning across 17 preset wideband frequencies (72.1–75.9 MHz) and unlimited listener support.

The system comes equipped with 12-bay chargers and rechargeable batteries to keep devices ready, and an ADA wall plaque to promote accessibility.

The package includes a coax antenna and rack panel kit for streamlined installation, optimizing performance in professional environments.

System Includes:
(1) FM T55C transmitter
(24) PPA R38N receivers
(24) EAR 022 surround earphones
(6) NKL 001 neckloops
(2) CHG 3512 12-bay chargers
(24) BAT 026-2 AA NiMH rechargeable batteries
(1) ANT 005 remote coaxial antenna
(1) IDP 008 ADA wall plaque
(1) RPK 005 rack panel kit

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
ANT 005:
•Use with: PPA T45, PPA T55, PPA T55C, PPA T27 Transmitters
•Connector type: F-connector
•Cable type: RG 59 coax
•Nominal Impedance: 75 Ohm
•Total Cable Length: 22 ft
•Active Antenna Length: 80 in
CHG 3512:
•Size: 9.5"L x 7.4"W x 1.7"H (24.1 cm L x 18.8 cm W x 4.3 cm H)
•Weight: 1.2 lbs (.54 kg), excluding power supply
•Color: Black ABS
•Power Supply Input: 90 - 240 VAC input
•Power Supply: TFP 037 Switching AC adapter, 5 VDC - 4A output
•Charging Rate: 16 Hour Charge: 140 mA Pulse/Maintain: 140 mA
•Charging Time: 16 hours nominal
•Unit Capacity: 12 Units
•Indicators: Individual Charging Indicators: Red LEDs. LEDs blink when batteries are charged
•Warranty: 1 year (cables and power supply warrantied for 90 days)
•Approvals: CE, WEEE, RoHS
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

CHG 3512 - Body-pack charger, 12 bay

EAR 022 - Surround Earphone

PPA R38N - PPA R38 FM Receiver

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