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The Personal PA® 457 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 feet, the PPA 457 is ideal for large venues where superior coverage is essential. This complete turnkey solution includes four PPA R37 receivers, each featuring seek-button channel selection with access to 17 pre-set wideband frequencies between 72-76 MHz. 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.
Replaced by FM 457.
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 T45, PPA T45NET, PPA T27 Transmitters
Screw to PCB
Alkaline, 1.2 Volt
3.5 mm mono
20 - 20kHz
Max input power
128dB @ 1kHz
10-3/8" (L) x 6-¼" (W) x 1/8" (H)
|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|
|Channels||17, 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|
|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-off||Enters 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.|
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 feet. 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.
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.
The PPA T45 shall be powered by an external 24VDC power supply.
It shall have a 75Ω 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.
8.45” W x 8.25” D x 1.72”H (21.5 cm x 21 cm x 4.4 cm)
Transmitter: 3.0 lbs (1.36 kg)
Shipping Weight: 4.50 lbs (2.04 kg) (Transmitter, Power Supply, Antenna and packaging)
Black/Silver with black legends on the front, white legends on the back
Standard 19” Rack, one EIA rack space high, 1/2 space wide
Desktop Style Transformer (TFP 048)
Input: 100-240 VAC, 50/60 Hz. IEC Line Cord
Output: 24 VDC, 750 mA, 18W. 2.5mm ID center positive barrel connector
Approvals: UL, CUL, Energy Star V, CSA listed
Power ON Indicator
Push On/Push Off latching power button, backlit green indicates power ON, backlight off indicates power OFF, fading from bright to dark indicates Sleep Mode*
Operating: +32° F to +104° F (0° C to 40° C)
Storage: -4° F to +158° F (-20° C to 70° C)
Audio Presets (Music, Voice, Hearing Assist, Custom), Frequency/Channel selection, Frequency/Channel mode, Audio Input Source (Microphone, Line, Phantom, Digital AES/EB, Digital S/PDIF), High Pass Filter, Low Pass Filter, Compression, RF Output Power, Screen Saver Delay, Test Tone (400 Hz), Headphone Volume, Headphone Source, Ethernet/Network Settings (PPA T45 NET and PPA T45 NET D).
72.1-75.9 MHz , 17 wideband channels (selectable)
± 2 ppm stability, 0-50˚ C
± 75 kHz maximum
RF Field Strength
Does not exceed 80 mV/m at 3 m
ANT 005, ANT 021, ANT 024, or ANT 025
Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector
*RF Time-out (Sleep Mode)
Menu selectable - 30 Min, 4 Hours, or Always On; timer starts when audio is below the -21dB VU level and no buttons are pressed
Menu selectable - Full, Medium, Low, Off
(1x) #10-32 stud connector in center of unit (pcb mounted)
(1x) F-connector on rear chassis
RF Transmit Indicator
1 Green LED, indicates RF “On Air”
Audio Processor Functions
DSP based; Compression: 1:1, 1.5:1 or 2:1; High Pass and Low Pass Filter Frequency control
31 – 16000 Hz, ±3 dB (“Music” Audio Preset)
≥74 dB Transmitted RF
Total Harmonic Distortion
Less than 0.25% @ 1 kHz (RF output)
Common Mode Rejection
>57 dB @ 1 kHz, Mic or Line
(1x) Combination 3-pin XLR, 1/4” (TRS) jack for Mic or Line Level Analog Audio, Balanced or Unbalanced Line Level, or Microphone with Selectable Phantom Power
(1x) XLR for Digital Audio, AES3/EBU, supported sample rates 44.1 kHz and 48 kHz
(1x) RCA for Digital Audio, S/PDIF, supported sample rates 44.1 kHz and 48 kHz
Audio Input Gain Adjust
In menu, adjustable to 0 to -50 dB, in 1dB steps
14.4 VDC applied through 2.2 kΩ resistors to analog combo jack: Pin 2 and Pin 3 on XLR jack, or tip and ring on 1/4” TRS jack
Audio Level Indicators
10-LED array that reads -18 to +9 dB at 3 dB intervals. 7 Green, 2 Amber, and 1 red LED. Green LEDs indicate normal operating audio level peaks, Amber LEDS indicate close to overload peaks, Red LED indicates overload peaks
Input Levels (Bal or Unbal)
(at Audio Input Gain = 0dB
Nominal (1st Amber LED)
(Displayed on Screen)
Absolute Maximum Ratings*
-55 dBV (1.7 mV RMS)
-15 dBV (180 mV RMS)
+20dBV (10.0 V RMS)
-25 dBV (55 mV RMS)
+16 dBV (6.3 V RMS)
+20 dBV (10.0 V RMS)
1/4” TRS stereo jack, mono signal, 15.7 mW, maximum in 33 Ω (level adjustable in menu 0 to -40 dB in 2 dB steps)
RCA jack (black), -10 dBV (.32 VRMS); Output impedance 100 Ω
RJ-45 on back of unit (PPA T45NET and PPA T45 NET D) supports CAT5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3 compliant, unique MAC address. Cat5e sheilded cable must be used to meet FCC requirements.**
RJ-45 on back of unit (PPA T45 NET D only) supports CAT5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3 compliant, unique MAC address. Cat5e sheilded cable must be used to meet FCC requirements.**
FCC including Part 15**, RoHS2, WEEE, Industry Canada
Lifetime PLUS Limited Warranty (90 Days on most accessories)
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!
*Stresses above these ratings may cause permanent damage. Exposure for extended periods may degrade reliability.
**Effective July 11, 2016, the FCC has mandated tighter emissions limits on auditory assistance transmitters (72-76 MHz) manufactured or imported after this date to help avoid interference with and/or degradation of other airborne signals (All products manufactured prior to July 11, 2016, are compliant). Williams Sound FM transmitters – PPA T46, PPA T27 and PPA T45 (all models) – all have received a Grant of Certification from the FCC and are fully compliant/approved under this new mandate.
Input: 100-240 VAC, 50/60 Hz, 0.5 A
Output: 24 VDC, 0.75 A
Single RCA - RCA audio cable
PPA T27, PPA T45, PPA T45NET audio input cable
RCA - RCA
All Williams Sound headphones and earphones are compatible with this product.
|FM Frequency/Channel Chart||Technical Bulletins||English|
|PPA T45 User Manual - Spanish||Manuals||Español|
|PPA T45/NET/D Specifications||Specifications||English|
|PPA 457 All Versions - Specifications||Specifications||English|
|PPA R37 Manual||Manuals||English|
|PPA R37 Specifications||Specifications||English|
|PPA R37 Manual Español||Manuals||Español|
|PPA T45/NET/D User Manual - English||Manuals||English|
|PPA T45 User Manual - Portuguese||Manuals||Portuguese|
|72 MHz Antenna Selection Guide||Application Guides||English|
|PPA R37 Manual French||Manuals||Français|
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