Williams Sound FM 557 Assistive Listening System With FM And Wi-Fi Transmission (4 Receivers) - Long & McQuade Music Educator Site
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Williams Sound FM 557 Assistive Listening System with FM and Wi-Fi Transmission (4 Receivers)

Departments > Pro Audio & Recording > Headphones > Headphone Distribution Systems > Williams Sound > FM 557 Assistive Listening System with FM and Wi-Fi Transmission (4 Receivers)
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SKU: # 733523
Model: #

FM 557


Wireless FM systems are ideal for large-group listening scenarios to help individuals overcome background noise.

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 expandable, accommodating any number of listeners.

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


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

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 Life: (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 Frequencies: 72.1-72.9, 74.7, 75.3-75.9 MHz*
Intermediate Freq.: 75 kHz
FM Deviation: 75 kHz
De-Emphasis: 75 S
LED Indicator: Power: Green; Low Battery: Flashes Green
AFC Range: +/- 120 kHz
Sensitivity: 2 V 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

Dimensions: 10-3/8" (L) x 6-1/4" (W) x 1/8" (H)
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