null Skip to main content
Williams AV FM 557 PRO FM Plus Assistive Listening System
Williams AV FM 557 PRO FM Plus Assistive Listening System
$2,280.00

Williams AV FM 557 PRO FM Plus Assistive Listening System

(No reviews yet)
SoundPro Item: 45963
MPN: FM 557 PRO
$2,280.00
Add to Wish List

Account manager
Have a Question? Ask an Account Manager

The FM 557 PRO system package is a complete turnkey solution. It includes 4 PPA R37N receivers and an FM+ transmitter for both FM and Wi-Fi transmission from the same box. The PRO bundle includes a coax cable and rack panel kit for professional installation.

This system features the cutting edge PPA T55 transmitter (replacing the T45 FM transmitter) with multiple digital audio input options, and an OLED display with easy-to-manage navigation and network control features.

Each PPA R37N receiver features a seek button channel selection with access to 17 selectable wideband frequencies between 72.1-75.9MHz. The system is expandable, accommodating any number of listeners. This system complies with 2010 ADA guidelines for hearing assistance all for nearly the same cost as traditional FM systems.

Williams AV FM 557 PRO System Features

  • Complete turnkey solution
  • Includes 4 PPA R37N receivers and an FM+ transmitter
  • Includes a coax cable and rack panel kit for professional installation
  • Easy-to-manage navigation
  • Network control features
  • FM T55 transmitter1
  • PPA R37N receivers4
  • EAR 022 surround earphones4
  • NKL 001 neckloops2
  • BAT KT6 two-bay chargers and rechargeable batteries2
  • ANT 005 remote coaxial antenna1
  • IDP 008 ADA wall plaque1
  • RPK 005 rack panel kit1
  • Dimensions8.45″ 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 T55 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˚ 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.
    • 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 button pressed for selected duration.
  • 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: Greater than 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 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 Ω (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)
  • ApprovalsFCC, RoHS3, WEEE, Industry Canada
  • Warranty2-year parts and labor
  • ANT 005
    • Use with: PPA T45,PPA T45NET, 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
  • EAR 022
    • Style: Around-ear speaker
    • Plug: 3.5mm mono
    • Cord: 39"
    • Driver Size: 23 mm
    • Nominal Impedance: 32Ω
    • Freq. Response: 20 - 20kHz
    • Weight: 15g
    • Max Power Input: 30 mW
    • Sensitivity: 118 dB @ 1kHz
  • IDP 00810-3/8" (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 R37N
      • 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 µS
      • 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 @ 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 Ω
      • 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.

In The Box

Customer Reviews