PPA 375 Hearing Assistance Systems

for Educational Institutions, Houses of Worship, Sport Centers, Parks and Recreation.

This wireless assistive listening system from Williams Sound is designed to discretely deliver audio to listeners in public and private venues such as churches, theaters, classrooms and stadiums. The PPA 375 PRO meet the ADA accessibility requirements for hearing assistance, and come with a 5 year warranty. Available with multi-channel receivers, it is also great for facilities requiring language translation.

The T35 transmitter configures itself to the appropriate setting – taking the guess work out of complex audio installation. Quickly choose between Voice, Music, or Hearing Assistance in the application preset menu. Operating up to 1000 feet, the T35 is ideal for auditoriums, stadiums, theaters, or other large venues where superior coverage is essential. In wideband mode it has 10 standard and  7 non-standard selectable channels. In narrowband mode the T35 has 77 selectable channels making it compatible with all Williams Sound receivers and most other manufacturer's receivers operating in the 72-76 MHz bandwidth.

The PPA T35 has a push button controlled LCD digital display on the front panel. There are three pre-configured (selectable) application presets: Hearing Assistance, Music and Voice. Configurations for Bandwidth, Frequency, High Pass Filter, Low Pass Filter, Compressor Slope, Compressor Gain and RF Output Power and Audio Input Sources: Microphone, Line, Simplex (phantom power) are also controlled with push buttons. The audio level is adjustable with a 10 LED array showing +9 to -18 at 3dB intervals. Other features on the front panel include 1/4" headphone jack for monitoring the source audio or transmitted audio, input overload indicator and a  “Power on” indicator. An RF “Off” timer automatically turns off  the RF signal after 1 hour of no audio activity. The PPA T35 has a combination 1/4" phone/XLR audio input jack as well as a RCA line output jack suitable for recording. It includes a whip antenna but is also equipped with a 75 ohm F-connector antenna for remote location of the antenna (20' coaxial antenna, ANT 005, is included with the PRO system only). The Transmitter is powered by a 24 VAC power supply via a 3-pin Molex connector.

The stylish, impact-resistant PPA R35 Single-Channel Receiver features crystal clear audio and is compatible with any Williams Sound Personal PA wideband transmitter. Although the PPA R35 receivers are pre-tuned from the factory, receivers can be tuned to any one of the 17 available channels in the 72-76 MHz band. Receivers include a detachable belt-clip for hands-free operation. A standard 3.5 mm mono phone jack accommodates low-impedance mono earphones, headphones and neckloops (right). The ADA accessibility requirements for hearing assistance, requires one neckloop per four receivers (minimum two). The PPA R35 receiver is equipped with a integrated volume on/off  switch and a green LED power "on" indicator. The green power "on" LED will illuminate red indicating low battery power. The PPA R35 receiver operates on two AA alkaline batteries for 100 hours of long-lasting operation. A battery selector switch inside the battery compartment also permits use of NiMH rechargeable batteries. Operating time with NiMH rechargeable batteries is approximately 50 hours.

For application where hearing assistance as well as simultaneous language translation is required, Williams Sound offers the optional PPA R35-8 Multi-Channel Receiver. The PPA R35-8 share the same design features as the single-channel receiver. In addition, it is pre-programmed to operate up to eight channels simultaneously when used with any Williams Sound Personal PA transmitter operating on the 72-76 MHz bandwidth. A tall rotary switch added to the control panel (right), easily lets the user select the appropriate digitally synthesized frequencies for rock solid tuning to favorite program. The battery life for the PPA R35-8 is approximately 50 hours with alkaline batteries and 32 hours with 1400 mAh rechargeable NiMH batteries.

When AA NiMH rechargeable batteries are used, up to 12 receivers can be charged at one time when used with the optional CHG 3512 multi-charger (left). The charger helps keep receivers organized and saves cost on having to replace alkaline batteries. The charger features individual charging LED indicators that blink when batteries are ready. The nominal charging time is approximately 16 hours but may vary based on the rated capacity of the NiMH batteries.

Williams Sound offers a Five-Year Warranty on all FM transmitters and receivers. Peripheral accessories such as batteries, cords, earphones, power supplies, headsets and neck-loops are warranted against defects in materials and workmanship for 90 days.