Digi-Loop DSP dual channel loop amplifier with Dante™ input


Digi-Loop is definitely state-of-the-art –the first to maximize modern hearing loop amplifier technology. Its network-control capability provides seamless, remote system set-up, operation, and monitoring via laptop or tablet. DSP audio processing offers flexible, powerful software control of mixing, equalization, compression, and more. Powerful Class D, pulse-width amplifiers maximize efficiency.

The Digi-Loop’s amplifier design offers single or dual 9.5 A rms loop outputs for perimeter loop(s), single array(s), dual loop, or phased-array configuration. A 70-100 V input provides a connection to a distributed speaker/paging system, ensuring announcements are heard by loop users.

System Includes

(1) PLA DL207 NET D Loop Amplifier

(1) WLC 004 Line Cord (US)

(1) IDP 009 ADA Wall Plaque (T-Coil)


  • Network control – allows control and calibration of unit remotely with application software
  • High continuous current 9.5 Arms (13.4 Apk) per output continuous
  • LCD Screen with VU metering, easy one-button menu control
  • DSP Audio Processing
  • Dante™ Input (“D” models)
  • USB for firmware updates
  • Input mixing, parametric equalization, compression, metal compensation, high and low-pass filters, AGC and audio delay
  • Power-save mode
  • Adjustable output delay for multiple amps in large venues
  • Fault warning and active protection against shorted or open circuits and overheating
  • Loop fault relay output
  • XLR and 3-position terminal block input configurable as microphone input or line-input, balanced or unbalanced.
  • Standard 1 RU, 19” rackmount
  • Magnetic signal couples directly to devices equipped with telecoils (T-coils) such as hearing aids, cochlear implants, or optional loop receivers.
  • DL207 suitable for phased-array or dual-loop systems; DL107 suitable for perimeter loop or single array.
  • Phased-array mode automatically produces 90° phase shift in slave loop output
  • Meets IEC Specification 60118-4 (when designed and commissioned properly)
  • Tested to IEC Specifications 62489-1 Benchmark Standards
  • Meets ADA / ADAAG guidelines.


DL207 NET D 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.



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.




2 Years

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