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Personal PA® Pro FM Assistive Listening System

  • Up to 1000' operating range

  • Transmitter is FCC Part 15 compliant

  • OLED display, push-button menus

  • Accomodates any number of listeners

  • Microprocessor controlled


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  • PPA 457 NET PRO



Personal PA® Pro FM Assistive Listening System

The Personal PA 457 NET D PRO features the cutting-edge PPA T45NET transmitter, with control/monitoring capability from any remote location, multiple digital audio input options, Dante Input, 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 NET D PRO 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. 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: The Personal PA® FM Listening System is 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.




(1) PPA T45 NET D Transmitter
(4) PPA R37 Receivers
(2) NKL 001 Neckloops
(4) EAR 013 Single Mini Earbuds
(1) ANT 025 Whip Antenna
(1) TFP 048 Power Supply
(1) WLC 004 Main Power Cord (U.S.)
(1) WCA 013 RCA Audio Cable, 3ft.
(4) BAT 001-2 AA Alkaline Batteries
(1) IDP 008 Wall Plaque
(1) ANT 005 Coaxial Antenna
(1) RPK 005 Rack Panel Kit





BAT 001-2      
Alkaline, 1.2 Volt      
EAR 013      
Plug: 3.5 mm mono    
Cord length: 39 inches    
Impedance: 32 Ohms    
Frequency Range: 20 - 20kHz    
Max input power: 5mV    
Sensitivity: 128dB @ 1kHz    
Driver size: 13 mm    
Weight: 9g    
Replacement earpad: EAR 015    
IDP 008      
10-3/8" (L) x 6-¼" (W) x 1/8" (H)      
PPA R37      
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         
Color: Black    
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    
De-Emphasis: 75 µS    
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 NET D      
Dimensions: 8.45” W x 8.25” D x 1.72”H (21.5 cm x 21 cm x 4.4 cm)    
Weight: Transmitter: 3.0 lbs (1.36 kg)    
  Shipping Weight: 4.50 lbs (2.04 kg)  (Transmitter, Power Supply, Antenna and packaging)    
Color: Black/Silver with black legends on the front, white legends on the back    
Rack Mount: Standard 19” Rack, one EIA rack space high, 1/2 space wide    
  1–2 units can be mounted in a single rack space with optional RPK 005 (single) or RPK 006 (double) Rack Mount Kits    
Power Supply: 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*    
Temperature Range: Operating: +32° F to +104° F (0° C to 40° C)    
  Storage: -4° F to +158° F (-20° C to 70° C)    
Menu Settings: 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).    
Operating Frequencies: 72.1-75.9 MHz , 17 wideband channels (selectable)    
Frequency Accuracy: ± 2 ppm stability, 0-50˚ C    
Deviation: ± 75 kHz maximum    
Pre-Emphasis: 75 µsec    
RF Field Strength: Does not exceed 80 mV/m at 3 m    
Compatible Antennas: ANT 005, ANT 021, ANT 024, or ANT 025    
Transmission Range: 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    
RF Power: Menu selectable - Full, Medium, Low, Off    
RF Outputs: (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    
Frequency Response: 31 – 16000 Hz, ±3 dB (“Music” Audio Preset)    
Signal-to-Noise Ratio: ≥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    
Audio Inputs: (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    
Phantom Power: 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): Nominal (1st Amber LED) Overload Warning Absolute Maximum Ratings*
(at Audio Input Gain = 0dB   (Displayed on Screen)  
Microphone: -55 dBV (1.7 mV RMS) -15 dBV (180 mV RMS) +20dBV (10.0 V RMS)
Line: -25 dBV (55 mV RMS) +16 dBV (6.3 V RMS) +20 dBV (10.0 V RMS)
Headphone Output: 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)    
Line Output: RCA jack (black), -10 dBV (.32 VRMS);  Output impedance 100 Ω    
Ethernet: 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.**    
Dante: 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.**    
Approvals: FCC including Part 15**, RoHS2, WEEE, Industry Canada    
Warranty: Lifetime PLUS Limited Warranty (90 Days on most accessories)    
TFP 048      
Input:  100-240 VAC, 50/60 Hz, 0.5 A    
Output:  24 VDC, 0.75 A    
0.3 lbs      
WCA 013      
Description: Single RCA - RCA audio cable    
Used with: PPA T27, PPA T45, PPA T45NET audio input cable    
Connector type: RCA - RCA    
Cable type: Two-conductor    
Impedance: N/A    
Length: 3 ft    
Brand Williams Sound
Model Number PPA 457 NET D PRO
Discontinued No
Type P.A. System
Range 1000'
Kit Includes • PPA T45NET Transmitter
• Four PPA R37 Receivers
• Two NKL 001 Neckloops
• Four EAR 013 Single Mini Earbuds
• ANT 025 Whip Antenna
• WCA 013 Audio Cable
• TFP 048 Power Supply
• Four BAT 001-2 AA Alkaline Batteries
• DP 008 Wall Plaque
• ANT 005 Coaxial Antenna
• RPK 005 Rack Panel Kit
Warranty Lifetime PLUS Limited Warranty

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