Digi-Loop Medium Area, Dual Channel Hearing Loop System


The DL207 SYS Hearing (Induction) Loop System, designed for medium spaces, extends hearing support to those with T-coil-enabled hearing aids and cochlear implants. Its network-control capability provides seamless, remote system set-up, operation, and monitoring via laptop or tablet. The dual-channel capability allows venues to broadcast the audio signal to two separate areas or in phased array designs.

This amplifier is well-suited for areas such as conference rooms and reception areas.

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.

System Includes

  • (1) DL207 NET – Induction Loop Amplifier
  • (2) PLR BP1 – Body-Pack Receivers with Batteries
  • (2) EAR 013 – Single Mini Earbuds
  • (1) BAT KT6 – Dual Drop-in Charger Kit (includes CHG 3502 Dual Drop-In Charger and (2) BAT 026-2 AA NiMH batteries)
  • (1) PLW F500 – 500 ft. Roll of Flat Power Loop Wire
  • (3) FWT 001 – Rolls of Flat Wire Warning Tape
  • (1) IDP 009 – ADA Wall Plaque (T-Coil)
Order system with -01 suffix for Euro Line Cord
Order system with -02 suffix for UK Line Cord
Order system with -04 suffix for Australia Line Cord

DL207 NET architectural and engineering specifications

The loop amplifier shall have a RJ-45 ethernet jack to provide configuration capability over an ethernet (10 base T) network. [nbsp] It shall have an optional RJ-45 Dante ethernet jack (“D” models only). It shall have a USB jack to provide firmware upgrades to the amplifier using a computer. It shall have one MIC/LINE LEVEL XLR 3-pin input, balanced or single-ended, with 24 V phantom supply in microphone mode. It shall have one LINE LEVEL 3-pole terminal block input, balanced or single-ended. It shall have a configurable PRIORITY INPUT function. It shall have a 70-100 V, 2-pole terminal block input, to provide a high/speaker-level input connection for use with distributed speaker systems. It shall have an internal frequency generator for calibration providing 100 Hz, 500 Hz, 1 kHz, 2.5 kHz and 5 kHz tones, and Pink Noise. It shall have one LINE OUTPUT, balanced or single-ended to provide loop-through connections for line level signals going to other equipment such as recording devices or additional loop amplifiers. There shall be four model options: single-output, dual-output, single output with Dante™ input, and dual-output with Dante™ input. It shall have a 1/4” Headphone jack on front panel for monitoring of inputs or outputs, selectable in the menu. It shall have a loop fault relay (NC,NO) output for triggering external systems when a loop fault occurs. It shall provide an output drive voltage of up to 16.1 Vrms, 22.8 Vpk per output. It shall provide an output current of up to 9.5 Arms, 13.4 Apk per output. It shall have a front control interface consisting of a backlit LCD screen and control button/dial. It shall have adjustable settings for input mixing, parametric equalization, compression, frequency-shaping, metal loss compensation, high and low-pass filters, AGC and audio delay. It shall display warnings for LOOP FAULT (open loop, shorted loop or out of impedance range), OVER TEMP, and CLIPPING.[nbsp] It shall have protection against loop faults and overheating (amplifier shuts down). It shall be controllable by devices such as a Windows Surface Tablet, or PC, with PC App software installed. It shall be compatible with either US or international power systems with the appropriate power cord. Performance shall meet IEC 60118-4 system performance requirements when loop system is designed and installed correctly. Specifications/testing shall conform to IEC 62489-1 benchmark testing standards The single-outputloop amplifier shall be the Williams Sound model DL107 NET. The dual-output loop amplifier shall be the Williams Sound model[nbsp] DL207 NET.[nbsp] [nbsp] The single-output loop amplifier with the Dante input shall be the Williams Sound model[nbsp] DL107 NET D. The dual-output loop amplifier with the Dante input shall be the Williams Sound model[nbsp] DL207 NET D. [nbsp]


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)
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.
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)
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).
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

IDP 009

10-3/8" (L) x 6-¼" (W) x 1/8" (H)  

PLR BP1 architectural and engineering specifications

The receiver shall be a body pack style Induction loop receiver. It shall operate for up to 200 hrs with two AA Alkaline batteries and be housed in a black plastic enclosure. It shall have battery recharge ability utilizing drop-in chargers. The receiver shall have a 3.5 mm headphone jack, on/off volume control. There shall be a tone control inside the battery compartment. It shall have a green power LED which will blink when the battery is low.
The receiver shall be the model PLR BP1.



4.1"H x 2.85"W x 1.38"D (104 mm H x 72 mm W x 35 mm D).


4.6 oz (130 g) with batteries, 2.6 oz (73 g) without batteries.


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



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) 0.0335 in - when paired with warning tape (FWT 001)
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


2 Years

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