Williams Sound Personal PA FM Plus Assistive Listening System - FM 557

$1,699.00 List Price:$2,122.00
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Williams Sound Personal PA FM Plus Assistive Listening System - FM 557


The FM Plus 557 assisted listening system – now with integrated Wi-Fi – has replaced the existing 457 systems for public venues. The FM 557 Plus offers both FM and Wi-Fi transmission from the same box for nearly the same cost as traditional FM systems.


  • This system features the cutting edge FM T55 transmitter (which replaced the T45 FM transmitter) with multiple digital audio input options and an OLED display with easy-to manage navigation, and network control features.
  • This complete turnkey solution includes 4 PPA R37N receivers, each featuring seek button channel selection with access to 17 selectable wideband frequencies between 72.1-75.9MHz. 
  • The system is expendable, accommodating any number of listeners.
  • This system complies with 2010 ADA guidelines for hearing assistance and is covered by Lifetime PLUS limited warranty.


  • Transmission Range: Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector
  • Dimensions (Receiver) : 4.1" x 2.85" x 1.38" (104 x 72 x 35mm)
  • Weight (Receiver) : 4.6oz (130g) with batteries. 2.6oz (73g) without batteries 
  • Color: Black
  • Battery Type: (2) AA Alkaline or 2 x AA NiMH
  • Audio Output: 35 mW max, peak into 16 ohms
  • 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
  • Operating Frequencies: 72.1-75.9 MHz , 17 wideband channels (selectable)

System Includes:

  • (1) FM T55 transmitter
  • (4) PPA R37N receivers
  • (4) EAR 022 surround earphones
  • (2) NKL 001 neckloops
  • (1) IDP 008 ADA wall plaque

Warranty Information

Warranty: Lifetime PLUS Limited Warranty (90 Days on most accessories)

Manufacturer: Williams Sound 

NOTE: Approved by the FCC for operation in U.S. markets. The system cannot be used in all countries. Check with your government radio regulations for 72-76 MHz operation.


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