William Sound FM Plus System with WAP FM SYSTEMS FM 557 PRO WAP


FM Plus System with WAP


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 PPA TT55 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.

This complete turnkey solution includes 4 PPA R37N receivers, each featuring seekbutton channel selection with access to 17 selectable wideband frequencies between 72.1-75.9MHz. The bundle includes a coax cable and rack panel kit for professional installation. 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.

The PRO version features coaxial cable and rack panel kit for professional installation. This kit comes with a Wireless Access Point.

ANT 005

Use withPPA T45,PPA T45NET, PPA T27 Transmitters
Connector typeF-connector
Cable typeRG 59 coax
Nominal Impedance75 Ohm
Total Cable Length22 ft
Active Antenna Length80 in


EAR 022

StyleAround-ear speaker
Plug3.5mm mono
Driver Size23 mm
Nominal Impedance32Ω
Freq. Response20 – 20kHz
Max Power Input30 mW
Sensitivity118 dB @ 1kHz


IDP 008

10-3/8″ (L) x 6-¼” (W) x 1/8″ (H)

PPA R37N architectural and engineering specifications

  • The PPA R37 receiver shall be encased in black, PC/ABS impact-resistant plastic with a hinged battery door. The receiver shall be a body-pack style and include a detachable belt-clip for hands-free operation. The receiver shall have a 3.5mm stereo/mono jack to accommodate stereo or mono low impedance earphones, headphones and neckloops. The receiver shall have a combination volume control with power on/off rotator dial. It shall have a green LED indicating battery and system status codes. The R37 shall have access to 17 preset wideband channels between 72-76MHz. Channel selection shall be made by pushing the seek button inside the battery compartment. The receiver shall have channel-lock capability.
  • The receiver shall have a slide switch inside the battery compartment to select disposable Alkaline or NiMH rechargeable battery operation. It shall have charger contacts on the bottom of the receiver for use with Williams Sound drop-in chargers CHG 3512 and CHG 3502. The R37 shall operate up to 50 hours with two disposable AA Alkaline batteries and up to 32 hours with two AA NiMH rechargeable batteries (BAT 026).
  • The receiver shall provide a maximum out of 35mW at 16ø with an earbud type earphone. The systems audio frequency response shall be 200Hz to 15kHz ± 3dB and the signal to noise ratio shall be 65dB min. The receiver sensitivity shall be 2μV or better at 12dB Sinad with squelch defeated. The R37 shall accept up to ±75kHz FM deviation and have a 75 μ s de-emphasis time constant.
  • The R37 shall have FCC, Industry Canada approvals and be compliant with RoHS and WEEE regulations. The receiver shall be covered by a Lifetime PLUS Limited Warranty, excluding earphones, headphones and batteries.
  • This receiver model shall be the Williams Sound model 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
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
Channels17, 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-offEnters 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.



Dimensions9.3” x 7” x 1.65” (236cm x 178cm x 42cm)
Weight1.8 lbs. (0.82 kg)
Standards Compliance2.4GHz: IEEE802.11n, IEEE802.11g, IEEE 802.11b; 5.xGHz: IEEE 802.11n, IEEE 802.11a; 802.11ac IEEE802.3, IEEE802.3u, IEEE802.3ab
InterfaceOne 10/100/1000M WAN Port (Auto MDI/MDIX); Four 10/100/1000M LAN Ports (Auto MDI/MDIX); One USB 3.0 Port
AntennaFour 5dBi Detachable Omni-Directional Antennas
PowerInput: 12VDC @ 3A
Max Power Consumption35W
Wireless Speed2.4GHz: 1000Mbps; 5GHz: 2167Mbps
FrequencyConcurrent 2.4GHz and 5GHz
Wireless SecurityWPA/WPA2-PSK, WPA/WPA2, AES
ApprovalsCE, FCC, RoHS, IC, RCM
WarrantyThree (3) year, parts and labor



2 Years

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