Motiva® FM Receiver

Product Highlights

  • Adjustable tone control
  • 21 hours continuous use
  • Low battery indicator


Hear the speaker’s message clearly and easily with the PFM R33 receiver from Williams Sound. Each receiver has a range of up to 150 feet when used with the Motiva PFM T36 transmitter, and will operate up to 21 continuous hours. Operating on 72-76MHz, users can select from one of 16 available channels. The PFM R33 receiver features adjustable tone control and a low battery indicator. Versatile 3.5 mm jack allows for a variety of earphone and headphone options; or equip it with a neckloop for compatibility with most telecoil-equipped hearing aids.

System Includes

(1) PFM R33 receiver

(1) EAR 013 single mini earbud

(1) CLP 023 belt clip

(2) BAT 001 AA alkaline batteries

*All items can be purchased separately

Pfm r33


  • 16 selectable channels
  • 72-76 MHz
  • Operates up to 150’ (46 m) with PFM T36
  • Improves listening for individuals or groups
  • 5 year warranty – 90 days on accessories


PFM R33 Architectural and Engineering Specifications

  • The PFM R33 shall be a wideband sixteen channel synthesized FM receiver operating on 72MHz to 76MHz. It shall be housed in a titanium colored PC/ABS plastic enclosure 4.6" x 1.1" x 2.8" and be compatible with the CHG 3502 and CHG3512 chargers.
  • The R33 shall be powered by two AA batteries and shall run for 21 hours on two alkaline disposable batteries and seventeen hours on the Williams Sound Corp. BAT 026 rechargeable batteries.
  • The R33 shall have the antenna integrated into the headphone cord. The top bezel shall have a 3.5mm stereo jack that can drive both stereo and mono headphones, a rotary on/off volume control and have a power LED and an FM indication LED.
  • Inside the battery compartment there shall be a rotary squelch control, rotary tone control, a sixteen position channel selector, an Alkaline or NiMH switch to select for charging operation and an output control which can reduce the maximum output by up to 17dB.
  • The R33 shall be FCC, Industrie Canada and RoHS compliant and shall have a five year warranty. This receiver shall be the Williams Sound PFM R33.


Dimensions 4.6" L x 2.8" W x 1.1" H (116 mm x 71 mm x 28 mm)
Weight 3.4 oz (96 g), no batteries
Color Titanium and Black
Housing Material Shatter-resistant PC/ABS plastic
Battery Type Two (2) AA 1.5 V non-rechargeable Alkaline batteries (BAT 001), 70 mA nominal current drain, approximately 21 hours life, or Two (2) AA 1.5 V NiMH rechargeable batteries (BAT 026), 70 mA nominal current drain, approximately 17 hours per charge, recharges in 14-16 hours, uses CHG 3502 or CHG 3512 Charger.
Operating Frequencies Selectable, 16 channels, 72.1 - 75.9 MHz*
FM Deviation ± 75 kHz max synthesized, crystal reference, PLL
Sensitivity 2.5 µV at 12 dB Sinad with Squelch defeated, Squelch set by user.
Freq Response 200 Hz to 12 kHz, -3 dB
Signal-to-Noise Ratio 62 dB at 100 µV
Receive Antenna Integral with earphone/headphone cord
External Controls FM Volume: rotary control with on/off switch
Environmental Mic Volume Rotary control
Internal Controls Tone: Rotary control
Channel 16 position rotary switch
Output (SPL) Limit Rotary control
Squelch rotary control
Indicators On/off/low battery and FM LED's
Mic Input 3.5 mm mono phone jack with electret microphone bias, external adjustable gain with 50 dB range
Audio Output Stereo jack produces 30 mW, max at 16 Ohm, can be reduced by internal SPL limit control up to 17 dB
Approvals/Directives FCC, Industry Canada, RoHS, WEEE
Warranty 5 years, parts and labor (90 days on accessories)



*NOTE: The PFM 330 system is approved by the FCC for operation in U.S. Markets. The system cannot be used in all countries. Check with your government´s radio regulations for 72-76 MHz operation.

Accessories for Motiva® FM Receiver [PFM R33]

All Williams Sound headphones and earphones are compatible with this product.

CLP 023 Belt Clip for Body Packs


Download/View Name Type Language
FM Brochure - Low Res Brochures English
Using Williams Sound Receivers as an Audio Source Technical Bulletins English
FM Brochure - High Res Brochures English
PFM 330/330 RCH Sell Sheet Sell Sheets English
PFM R33 Specifications Specifications English
PFM 330/330 RCH Sell Sheet Sell Sheets Español


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