Williams Sound FM 457-24 PRO Personal PA FM Assistive Listening System with 1 Transmitter, 24 Receivers & 24 Surround Earphones

24-Receiver System / R37 Receivers
The FM 457-12 PRO features the cutting-edge PPA T45 transmitter, with multiple digital audio input options and an OLED display with easy-to-manage menu navigation. Features three powerful microprocessors and the same high-quality audio and RF performance you've come to expect from Williams Sound.

With an operating range of up to 1000', the FM 457-12 PRO is ideal for large venues where superior coverage is essential. This complete turnkey solution includes 12 R37 receivers, each featuring seek-button channel selection with access to 17 pre-set wideband frequencies between 72-76 MHz.

Includes a coaxial 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.

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.

PPA R37 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 16 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 2microV or better at 12dB Sinad with squelch defeated. The R37 shall accept up to +/-75kHz FM deviation and have a 75 micro 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.

PPA T45NET D Architectural and Engineering specifications
PPA T45 / PPA T45 NET / PPA T45 NET D

There shall be three models of the transmitter - an FM transmitter only, one with network control and one with network control and a Dante input.

The transmitter shall be a microprocessor-based unit. It may be configured through the on-screen menu.

The model with network control will be configurable over an ethernet (10 base T) network accessible through common web based browsers.

The model with Dante input will also be configurable over an ethernet (10 base T) network accessible through Dante Controller.

The transmitter shall have a transmitting range of up to 1000'. It shall have 17 wideband channels operating on 72.1-75.9 MHz. It shall be supplied with a top mount 39" whip antenna and external power supply.

Front Panel:
The transmitter shall have an OLED screen displaying current settings and menu functions.

Channel/frequency selection, audio input source, audio presets (Hearing Assist, Music, Voice and Custom), audio input level, high and low pass filter, compressor gain and RF output power shall be configurable via the front OLED menu or web browser.

There shall be a 10 segment LED bar graph indicating audio input level and an RF "on air" LED. A 1/4" stereo headphone jack will allow monitoring of the transmitted audio.

Rear Panel:
The PPA T45 shall be powered by an external 24VDC power supply.

It shall have a 75 Ohm F-connector on the rear for remote antenna applications and an RCA line level output.

It shall have analog 1/4"/XLR combo microphone or line level input jack, XLR AES3 and S/PDIF RCA digital input jacks. The model with Ethernet control shall have an RJ-45 Ethernet jack.

The transmitter shall be compatible with all Williams Sound FM wideband 72-76 MHz receivers and have a lifetime limited warranty.

All transmitter models shall comply to FCC Part 15.

The FM transmitter shall be the Williams Sound model number PPA T45.

The FM transmitter with network control shall be the Williams Sound model number PPA T45 NET.

The FM transmitter with network control and Dante input shall be the Williams Sound model number PPA T45 NET D.