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Description
Williams AV DL207 SYS Digi-Loop Medium Area, Dual Channel Hearing Loop SystemThe DL207 SYS hearing loop system maximizes modern amplifier technology. Its network control capability provides seamless, remote system set up, operation, and monitoring of the induction loop system via a laptop or tablet. DSP audio processing offers flexible, powerful software control of mixing, equalization, compression, and more. Powerful Class D pulse width amplifier maximizes the efficiency of the unit. The assistive listening systems design
The DL207 SYS hearing loop system maximizes modern amplifier technology. Its network-control capability provides seamless, remote system set-up, operation, and monitoring of the induction loop system via a laptop or tablet. DSP audio processing offers flexible, powerful software control of mixing, equalization, compression, and more. Powerful Class D pulse-width amplifier maximizes the efficiency of the unit.
The assistive listening system’s design offers a dual 9.5 A rms loop output for dual loop or phased array configuration. A 70-100 V input connects to a distributed speaker/paging system, ensuring announcements are heard by hearing aid users.
Meet IEC 60118-4 standards on system performance when integrated into a correctly designed and installed system. The DL207 SYS is also tested to IEC Specifications 62489-1 Benchmark Standards.
Specifications
| GENERAL | |
| Dimensions | 1 RU Rackmount, 19” W x 1.75” H x 10” D. Chassis is 17” W. |
| Weight | DL107: 9.2 lbs (4.2 kg) DL207: 9.2 lbs (4.2 kg) |
| Color | Case: Black, white and blue legends on front, white legends on back. LCD: Backlit Blue. |
| Fan cooling | Variable Speed, Temperature Controlled |
| Power supply | Internal, Universal 100-240 VAC, 50/60 Hz, 200 Watt. Fuse: 5 x 20 mm, 5 A, 250 V. AC power plug is IEC 320-C14. |
| Heat output @ 120 VAC | DL107 : Sleep State: 63 BTU/hr; Idle State: 71 BTU/hr; Driving one loop @ 9.5 A: 339 BTU/hr |
| DL207: Sleep State: 63 BTU/hr; Idle State: 84 BTU/hr; Driving two loops @ 9.5 A each: 638 BTU/hr | |
| Ethernet | (1x) RJ-45; 10-100 MBps. |
| USB | (1x) standard-B. USB 1.1, 2.0 or 3.0 supported. |
| Environment | 0-35° C ( 32-95° F), 0-90% relative humidity, |
| Coverage area* | DL207 (dual output amplifier): 30,000 sq. ft. (2,786 sq. m.) (Perimeter Loops, 3:1 aspect ratio, both outputs driven) 18,000 sq. ft. (1,672 sq. m.) (Perimeter Loops, 1:1 aspect ratio, both outputs driven) |
| DL107 (single output amplifier): 15,000 sq. ft. (1,393 sq. m.) (Perimeter Loop, 3:1 aspect ratio) 9,000sq. ft. (836 sq. m.) (Perimeter Loop, 1:1 aspect ratio) | |
| INPUTS | |
| Dante input | On “D” models only. (1x) RJ-45;100 Mbps. Minimum latency: 2 ms. Audio sample rates supported: 44.1, 48 kHz. Resolution: 24 bits. |
| Line inputs | (1x) 3-position terminal block, 10 kΩ input impedance. Configurable/accepts -10 dBV, -4 dBu, +4 dBu, +8 dBu, balanced or unbalanced. Level adjustable 0 to -96 dB. |
| Mic/Line inputs | (1x) XLR 3-pin jack. Input impedance: 1.5 kΩ Mic, 10 kΩ Line. Configurable/Accepts: Mic, Line -10 dBV, Line +4 dBu, or Line +8 dBu, balanced or unbalanced. Phantom supply (24V). |
| 70-100 V input | (1x) 2-position terminal block; high/speaker-level input (accepts 25 V, 70 V or 100 V) from distributed audio/paging systems. |
| OUTPUTS | |
| Line outputs | (1x) 3-position terminal block; loop-through of Mic/Line Input 1 [&] Line Input 2, +4 dBu, Balanced or Unbalanced. The line outputs mirror the audio of the loop output. |
| Loop output(s) | (1x) 2-position terminal block per output |
| Audio output delay | Adjustable from 0 to 165 msec |
| Headphone output | (1x) 1/4” stereo headphone jack, on front of unit. Monitored input or output selectable in menu. |
| Loop fault relay | (1x) 3-position terminal block providing NC, NO and Common. Contact rating: 2.0 A @ 30 VDC. |
| Loop output drive voltage | 16.1 Vrms (22.8 Vpk) continuous |
| Rated loop output current* | 9.5 Arms (13.4 Apk) per output |
| Loop resistance range | 0.5 Ω to 3.0 Ω (DC) |
| AUDIO | |
| Rated load* | 0.5 Ω DC with 135 µH inductance |
| Frequency response | 45 Hz to 9.0 kHz ± 2 dB (1 kHz ref.) |
| Rated loop THD* | [lt]1 % at rated output current (1 kHz sine wave). |
| OTHER | |
| Front controls | Front LCD display menu access/adjustment via control button/dial. |
| Adjustable settings | Input mixing, parametric equalization, compression, metal loss compensation, high and low-pass filters, AGC and audio delay, output levels. See User Manual for adjustment range(s). |
| Internal calibration tools | Test tone generator with pink noise, loop current adjustment/matching. See User Manual for details. |
| Other features | Save/load configuration, loop test, priority input selection with adjustable threshold, loop fault relay, open/short and thermal protection. See User Manual for details. |
| Network control [&] firmware | Function control and calibration by DigiLoop PC App via ethernet (RJ-45). PC App requires Windows 7 or higher. Firmware updates through USB only. |
| Warranty | 2-year warranty against component failure and manufacturing defects. See Full Warranty statement on the website for details. |
| Approvals | CE, UL, ULC, FCC, Industry Canada, RoHS, WEEE, CB scheme, RCM |
| Standards compliance | This product is designed to meet the IEC-60118-4 standard when correctly designed, installed and commissioned. Test Specifications provided to the IEC 62489-1 standard. |
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 |
FWT 001
| Description | Cloth-based warning tape, 2 in. Width, 165 ft Length per roll. |
| Dimensions | 6" Dia x 2" W x 165' L Roll |
| Weight | 1.28lbs |
| Color | White cloth. Williams Sound logo, T-Coil Logo, and Warning Text. |
| Warning Text | Warning: Do not cut or disturb - Hearing assistance induction loopwire |
| Used with | PLW F300, PLW F500 |
PLR BP1
| Dimensions: | 4.1"H x 2.85"W x 1.38"D (104 mm H x 72 mm W x 35 mm D). |
| Weight: | 4.6 oz (130 g) with batteries, 2.6 oz (73 g) without batteries. |
| Color/Material: | Black ABS/polycarbonate molded plastic case. |
| Battery Type: | (2) AA (1.5VDC) Alkaline or NiMH (rechargeable). |
| Battery Life: | Up to 200 hours with Alkaline batteries. |
| LED Indicator: | Green LED indicates power on, flashes when batteries are low. |
| Headphone Jack: | 3.5mm stereo TRS jack works with mono or stereo headphones. |
| Volume control: | External switched thumb wheel controls power on/off and volume level. |
| Tone control: | Rotary control inside battery compartment (1kHz reference at 400mA/m input with Tone at mid position) |
| Induction Coil: | Maximum reception: receiver oriented vertically |
| Power Output: | 35mW (max) into 33 ohms mono impedance |
| THD: | [lt]2% |
| Frequency Response: | 300Hz to 10KHz, -6dB |
PLW F500
| Length | 500 ft (152.4 m) |
| Width | OD: 22 mm (with insulation) ID: 19 mm (bare copper) |
| Thickness | OD: 0.17 mm (with insulation) ID: 0.1 mm (bare copper) |
| Cross Sectional Area (Bare Copper) | 1.9mm2 |
| Spool Dimensions | 8-1/8” W x ¾” H (20.6 cm W x 1.9 cm H) |
| Spool Weight | 6.5 lbs (2.9 kg) |
| Color/Material | Copper with Mylar (polyester) encapsulation |
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4.1 ★★★★★
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Product Reviews
★★★★★ 5
Easy to study and understand
Format: Paperback
This book is easy to read and i tend to recall information better after reading it. It breaks down topics and focused on the important information or a must to know for NCLEX. I will recommend this book to anyone taking NCLEX.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 9, 2026
★★★★★ 4
Great book!
Format: Paperback, Format: Paperback
I am still in nursing school- but I like to try read and gain knowledge ahead of time. I do this so that with upcoming semesters, the concepts are not completely foreign to me and I’m not blindsided by new topics. I have been following a lot of the YouTube videos with Mark and Dr. Sharon and have found them very educational even while in nursing school. I purchased this book and I really am happy with it. I was hoping it would have offer more info in it , maybe some more facts here and there but it’s basically an answer bank. It does have some small facts but they are not in depth at all- just mainly recall information. It really is based off just past memory from your education. For me personally, I find this book pretty useful to have if you feel confident in all topics- and plan to go for your NCLEX..however, if you’re still a bit rusty on some topics, you won’t really be able to rely solely on this book to brush up on information- not in a manner of depth (which I guess is the point). I think applying his lectures, listening to their YouTube videos and applying this book would make the ultimate go-to. The book alone is wonderful- but it’s simply just answer banks to help recall the info. Which is great if you’re looking for strictly recall.
I was fortunate enough to find his lectures on Reddit along with some of the “yellow pages” from other students. I can apply that with this book and be confident in upcoming tests , as his lectures are incredible.
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Reviewed in the United States on April 28, 2026
★★★★★ 5
The Blue Book
Format: Paperback
I am sooooooo happy I bought this book!! It breaks down nursing into easy understandable language. Certain things I was struggling with like ABG’s and acid base balance, this book makes it easy to understand. Thank you Mark Klimek!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
★★★★★ 5
passing Nclex RN
Format: Paperback
i used this book the last 2 weeks before writing Nclex. i passed due to this book for final review! watching videos online together with this gives you all you need
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Reviewed in the United States on February 15, 2026
★★★★★ 5
A wonderful edition!
Format: Paperback
I highly recommend this edition above all others available. The translation is very clear and lucid and actually makes Timaeus and Critias real page-turners.
Not only is the translation great, but the introductory material is incredible. While one review here mentions that the translation misses some of the nuance of Platonic thought (which I don't necessarily agree with that), the introduction more than makes up for that. So many available editions of Timaeus are written by reluctant scholars who act puzzled as to why they've been asked to introduce Timaeus when they are obviously either not fond of it, or dismissive of it as an authentic piece of Plato's canon. At last, we have an edition that is faithful and generous to the source material!
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Reviewed in the United States on February 14, 2024
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