Williams Sound FM 557 PRO Assistive Listening System (4 Receivers) With Rack Panel Kit And Cable - Long & McQuade Music Educator Site
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Williams Sound FM 557 PRO Assistive Listening System (4 Receivers) with Rack Panel Kit and Cable

Departments > Pro Audio & Recording > Headphones > Headphone Distribution Systems > Williams Sound > FM 557 PRO Assistive Listening System (4 Receivers) with Rack Panel Kit and Cable
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SKU: # 733524
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FM 557 PRO


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. 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.

System Includes:
(1) FM T55 transmitter
(4) PPA R37N receivers
(4) EAR 022 surround earphones
(2) NKL 001 neckloops
(2) BAT KT6 two-bay chargers and rechargeable batteries
(1) ANT 005 remote coaxial antenna
(1) IDP 008 ADA wall plaque
(1) RPK 005 rack panel kit


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

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

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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