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Description
Williams AV FM 558-24 PRO FM+ PRO System Package (24 R38 receivers)The FM 558 PRO system package is a complete turnkey solution. It includes 4 PPA R38 receivers and an FM+ transmitter for both FM and Wi Fi transmission from the same box. The PRO bundle includes a coax cable, and rack panel kit for professional installation. This system features the cutting edge PPA T55 transmitter (replacing the T45 FM transmitter) with multiple digital audio input options, and an OLED display with easy to manage navigation and
The FM 558 PRO system package is a complete turnkey solution. It includes 4 PPA R38 receivers and an FM+ transmitter for both FM and Wi-Fi transmission from the same box. The PRO bundle includes a coax cable, and rack panel kit for professional installation.
This system features the cutting edge PPA T55 transmitter (replacing the T45 FM transmitter) with multiple digital audio input options, and an OLED display with easy-to-manage navigation and network control features.
Each FM R38 is a multi-channel FM receiver with a high-resolution OLED screen. The receiver comes with earphones and batteries, but is otherwise identical to the PPA R38. The R38 offers a quick view of receiver status and immediate entry to all user settings. On-screen channel selection with easy access to 17 pre-set, wide-band frequencies (72-76 MHz). The system is expandable, accommodating any number of listeners. This system complies with 2010 ADA guidelines for hearing assistance all for nearly the same cost as traditional FM systems.
Specifications
| Dimensions | 8.45″ W x 8.25″ D x 1.72″H (21.5 cm x 21 cm x 4.4 cm) | |||
| Weight | Transmitter: 3.2 lbs (1.45 kg) | |||
| Color | Black/Silver with silver 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 |
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| Power Supply | Desktop Style Transformer (TFP 062); Input: 100-240 VAC, 50/60 Hz. IEC Line Cord; Output: 24 VDC, 750 mA, 18W. 2.5mm ID center positive barrel connector | |||
| 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 +122° F (0° C to 50° C); Storage: -4° F to +158° F (-20° C to 70° C) | |||
| User Interface | 3.12” High Resolution OLED display with selections via buttons. Hosted Web page. Remote control and monitoring. | |||
| Dante | Only available on FM T55 D | |||
| Ethernet | RJ-45 on back of unit supports CAT 5e cable lengths up to 328 feet (100 meters); 10/100 Base-T IEEE 802.3 compliant, unique MAC address | |||
| RF Section | ||||
| 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 microsec | |||
| RF Field Strength | Does not exceed 80 mV/m at 3 m | |||
| Compatible Antennas | ANT 005, ANT 021, ANT 024, or ANT 025
Refer to Williams AV’s Antenna Selection Install Guide for FCC-compliant antennas for this product. |
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| Transmission Range | Up to 1000 ft (304 m) with ANT 005 coaxial antenna mounted on rear chassis connector | |||
| RF Outputs | (1x) #10-32 stud connector in center of unit (pcb mounted) (1x) F-connector on rear chassis |
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| RF Transmit Indicator | 1 Green LED On Air Indicator | |||
| RF Power | Full, Medium, Low or OFF indiacted by menu icon. | |||
| RF Time Out (sleep mode) | 30 min. duration, 4 hr. duration, or Always On selected via menu. Starts when audio is below -18 dB level with no button pressed for selected duration. | |||
| Audio Section | ||||
| 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 (re: 1 kHz, ±3 dB) (“Music” Audio Preset) | |||
| Signal-to-Noise Ratio | 67 dB (typical) Transmited RF | |||
| Total Harmonic Distortion | Less than 0.25% @ 1 kHz (RF output) | |||
| Common Mode Rejection | Greater than 57 dB @ 1 kHz, Mic or Line | |||
| Audio Inputs | (1x) Combination 3-pin XLR, 1/4″ (TRS) jack for balanced or unbalanced line level, or balanced or unbalanced microphone with selectable phantom power | |||
| Audio Input Gain Adjust | In menu, adjustable to 0 to -50 dB, in 1dB steps | |||
| Phantom Power | 14.4 VDC applied through 2.2 kOhms 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 | |||
| Headphone Output | 1/4″ TRS stereo jack, mono signal, 14.85 mW at +9dB, 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 ohms at +9dB | |||
| Input Levels (Bal or Unbal) (at Audio Input Gain = 0dB) |
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| Microphone |
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| Line |
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| Approvals | FCC, RoHS3, WEEE, Industry Canada | |||
| Warranty | 2-year parts and labor | |||
ANT 005
| Use with | PPA T45, PPA T55, PPA T55C, PPA T27 Transmitters |
| Connector type | F-connector |
| Cable type | RG 59 coax |
| Nominal Impedance | 75 Ohm |
| Total Cable Length | 22 ft |
| Active Antenna Length | 80 in |
CHG 3512
| Size: | 9.5"L x 7.4"W x 1.7"H (24.1 cm L x 18.8 cm W x 4.3 cm H) |
| Weight: | 1.2 lbs (.54 kg), excluding power supply |
| Color: | Black ABS |
| Power Supply Input: | 90 - 240 VAC input |
| Power Supply: | TFP 037 Switching AC adapter, 5 VDC - 4A output |
| Charging Rate: | 16 Hour Charge: 140 mA Pulse/Maintain: 140 mA |
| Charging Time: | 16 hours nominal |
| Unit Capacity: | 12 Units |
| Indicators: | Individual Charging Indicators: Red LEDs. LEDs blink when batteries are charged |
| Warranty: | 1 year (cables and power supply warrantied for 90 days) |
| Approvals: | CE, WEEE, RoHS |
EAR 022
| Style | Around-ear speaker |
| Plug | 3.5mm mono |
| Cord | 39" |
| Driver Size | 23 mm |
| Nominal Impedance | 32Ω |
| Freq. Response | 20 - 20kHz |
| Weight | 15g |
| Max Power Input | 30 mW |
| Sensitivity | 118 dB @ 1kHz |
NKL 001
| Color: | Black |
| Weight: | 1.5 oz |
| Length: | 18.5” cord |
| Connector: | NKL 001: 3.5 mm mono plug NKL 001-S: 3.5 mm stereo plug with ring disconnected |
| Impedance: | 8-16 Ohms |
| Input Power: | 500 mW max |
| Magnetic Field Strength: | 25 mW input at 1000 Hz produces 1.7 A/m 6” above the center of loop 85μW input produces 0.1 A/m (IEC Standard) |
| Approvals: | RoHS, WEEE |
| Warranty: | One Year |
PPA R38N
| 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/Silver. Black ABS Plastic case with Aluminum faceplate. |
| Battery Type: | (2) AA Alkaline or (2) AA NiMH Rechargeable |
| Battery Life: | (2) AA non-rechargeable alkaline batteries (BAT 001-2), approx. 50 hrs. |
| (2) AA rechargeable NiMH batteries (BAT 026-2), 1500mAh, approx. 32 hrs. | |
| Current Consumption: | 52mA nominal |
| Operating Temp. Range: | 32° – 122°F (0° to 50°C) |
| Channels: | 17 Wideband, accessed via menu |
| Operating Frequencies: | 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* |
| FM Deviation: | 75 kHz |
| De-Emphasis: | 75 µS |
| Display Screen: | 1" OLED |
| Power Indication: | Power button, backlit green. Good battery strength - glows solid. Low battery - flashes. |
| Sensitivity: | 2 µV at 12 dB Sinad with squelch defeated |
| Input Overload: | 100 mV |
| Frequency Response: | 200 Hz – 15 kHz, ±3dB |
| Modulation: | FM, +/- 75 kHz peak deviation |
| Signal-to-Noise Ratio: | Minimum 65 dB @ 1.0V |
| Receive Antenna: | Integral with earphone/headphone cord |
| Audio Output: | 35 mW max at 16 Ω |
| Headphone Connector: | 3.5 mm stereo jack, mono output for stereo or mono earphones/headphones |
| Supplied Earphone: | Stereo,earbud-type with foam cushion, 3.5 mm plug, 32 Ω |
| Power Save Mode: | Enters sleep mode after approximately 3 minutes of no RF signal |
| Approvals: | FCC, Industry Canada, RoHS, WEEE |
| Warranty: | Lifetime PLUS Limited Warranty, 90 Days on most accessories. |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Hallelujah… finally, I found the right pillow!!!
Size: Queen (Pack of 1), Color: White
I have spent a lot of money searching for the right pillow. I recently tried to Tempur-pedic that cost twice with this pillow cost. Tempur-pedic flattened out. I’ve had this pill for a few weeks now and it works wonders. I am a paraplegic. You can have a lot of neck problems. I love the fact that this pillow is adjustable. I immediately saw it was too stuffy and took a bunch out. It works perfect so glad I didn’t spend money on a $200 purple pillow.
I read a lot of reviews and there were a lot of complaints about the odor. Mine did smell funny when it came out of the box. I immediately threw it in the dryer with a few bounce fabric sheets came out smelling fine.
Pillows are a very individual thing, but I think for 40 bucks this pillow is worth a try. I’m really enjoying mine about one of those silk pillowcases to go over it and it sleeps cool and comfortable. Best wishes in your search for the right pillow.
Update: I’ve been using this pillow several months and it continues. Give me a good night rest pain-free.. well worth the money.
UPDATE: I have been using this pillow for three months and it still works great. It does not flat out or get hot..
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
★★★★★ 5
Soft comfortable very good pillow
Size: King (Pack of 1), Color: White
I really love my new pillow it's great and comfortable. Yes, it has a little smell, but if you wash the pillowcase and put the pillow on the window for a day you won't notice anything anymore.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 5
Best place for head
Size: Queen (Pack of 1), Color: White
Do you love not getting sleep and sweating all over your pillow at night when you are asleep? If so then don't buy this pillow! If you want a good nights sleep and cool pillow like me this is the one. Ive always been ehh towards spending so much on a pillow but its 100% worth it, I sleep so much better and it forms to my head and keeps me cool at night. Great support even for my big head and comes with a bag of extra stuffing if you want to have a little more firmer pillow. Highly recommend
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Reviewed in the United States on April 4, 2026
★★★★★ 3
Oversized
Size: Queen (Pack of 2), Color: White
I have chronic neck pain. I am forever buying new pillows. Sometimes I think I found the perfect pillow but then three months later they’re losing their loft. I thought I would give these pillows to try since the stuffing is removable. Now these pillows are really oversized. To the point where I thought that they had sent me king-size pillows but I double checked the packaging and they were Queen. I ended up having to buy king-size pillowcases for them because they just barely fit in the queen size and the pillowcases would always end up pulling back from the edge. So that’s a negative one star there. Now I’ve been sleeping on these pillows for a while and they have held up well. I did end up removing some of the stuffing because it was just too much. I’m a side sleeper and when I use this pillow, it does a good job of keeping my neck in alignment. However, the pillow tends to migrate up as I sleep. Or I tend to slip down off the pillow, either or. So that’s why I’ve removed a second star. Maybe if I removed more stuffing that wouldn’t happen, but then I feel like the loft would be too little. I will say that these provide great support when sitting up in bed reading or watching TV. So would I buy them again? Probably not. Am I going to keep using them? Yes
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Reviewed in the United States on December 23, 2025
★★★★★ 5
Amazing - Stop Scrolling and Buy This Pillow
Size: Queen (Pack of 1), Color: White
I have been an Amazon customer ever since the very beginning, and this is my first review. Not because I haven’t purchased tons of amazing things (and a few bad ones), just never felt the need.
However, I researched pillows for longer than I care to admit, and decided on this one.
I’ve had it for about six months and absolutely love it. No lie, I genuinely look forward lying my big head on it after a long day.
I am a side sleeper, but flip flop all around through the night and it’s great in every position.
Pros:
Stays nice and cool, which is soothing regardless of the time of year.
Has a sort of quilted textured pattern on the zip up cover, gives it a luxury feel, that breaths nicely even when a pillow case is added.
The fill is fully adjustable to your preference.
I knew it came with extra filling but was worried it would not be enough. Wrong. It was very full and I ended up taking some out until it was perfect.
It comes vacuum sealed and suggests it may take some time to fully take shape. However, I found it to be about 90% almost instantly and was sleeping on it a couple hours later.
There was no unpleasant scent sometimes associated with memory foam items.
The foam itself is very nice, a mix of what appears to be shredded and cotton candy cloud like. Very brilliant idea, as it is somehow supportive, soft and firm all at once.
The affordability of this pillow compared to some of the others in this category can’t be overstated.
Oh, and the packaging was very thoughtfully and securely done.
If you are like me, an over thinker, I would suggest just taking this for a spin. It’s amazing.
I’m not a bot, or working for the company. I’m just truly satisfied, love this pillow, and have been sleeping great.
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Reviewed in the United States on April 6, 2026
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