Digi-Loop DSP dual channel loop amplifier

Product Highlights

  • Dante™ inputs
  • Crestron® Control
  • Control via Ethernet or RS-232 for seamless, remote operation
  • USB for firmware updates
  • DSP Audio Processing for flexible, powerful control of sound quality
  • Digital Audio Inputs (AES3/XLR and Dante) - multiple options offer greater flexibility
  • Meets IEC Specification 60118-4


The world’s first, network-controlled Digi-Loop induction loop amplifier from Williams Sound now features Dante™ inputs and cutting-edge connectivity via Crestron®. This next-generation Digi-Loop continues to offer DSP audio processing with flexible, powerful software control of mixing, equalization, compression, loop phase shift and more. Its potent Class D, pulse-width amplifiers maximize efficiency, and reduce size and weight. Digi-Loop’s dual-amplifier design offers impressive flexibility, with the option of a single 12A output for large perimeter loops, or dual 10A outputs for phase loop arrays. With its ability to power a loop and a speaker, Digi-Loop shines as a complete room solution.

System Includes

(1) PLA DL 210 NET D Loop Amplifier

(1) WLC 004 Line Cord (US)

IEC 60118-4


  • Dante™ inputs
  • Crestron® control
  • DSP Audio Processing
  • Digital Inputs - AES3/EBU and Dante
  • LCD Screen with Metering
  • Ethernet or RS-232 control
  • USB for firmware updates
  • Mixing, Equalization, Compression, Phase, and Frequency-Shaping
  • Power-save mode
  • Master Gain Control
  • High output current: 12/10 amps
  • Active protection against short circuits
  • XLR input configurable as microphone input or line-input, balanced or unbalanced.
  • Standard 2RU, 19" rack enclosure
  • Magnetic signal couples directly to hearing aids equipped with telecoils (T-coils)
  • Can be used with optional loop receivers
  • Suitable for set-up of high or low-overspill systems, or interleaved arrays
  • Meets ADA / ADAAG guidelines
  • Meets IEC Specification 60118-4


PLA DL210 NET D Architectural and Engineering Specifications

The loop amplifier shall be designed for rooms of up to 6500 sq. ft. (600 sq. m) with loop signals and is the ideal solution for events and meeting venues.
It shall have one XLR digital audio input for use with digital audio sources such as pro audio consoles with digital AES/EBU output, etc. It shall have an ethernet jack for Dante digital audio input.
It shall have an ethernet jack to provide configuration capability over an ethernet (10 base T) network.  It shall have an additional ethernet jack for connection to a Dante network.
It shall have an RS-232 jack to provide control capability from 3rd-party controllers such as Crestron, AMX, Extron, etc.
It shall have a USB jack to provide access to internal configuration with a computer.
It shall have two MIC/LINE LEVEL inputs that can be configured as LINE (balanced) or as MICROPHONE input(s).  These inputs shall be mixed with the RCA LINE inputs into one mono output for the loop.
It shall have two RCA LINE inputs that can be used to supply one or two channels of audio.  These two channels shall be mixed together, then mixed with the two MIC/LINE inputs into one mono output for the loop.
It shall have a 70-100V input to provide a speaker-level input connection for use with distributed speaker systems.
It shall have two LINE OUTPUTS to provide loop-through connections for line level signals going to other equipment such as recording devices.  These line outputs shall be the summed combination of the MIC/LINE LEVEL inputs and the RCA LINE inputs.
It shall have two LOOP OUTPUTS for running either one large loop, two individual loops, a phased-array system, or 1 loop + 1 speaker.  Output A will be configurable in the menu to be a speaker output.
It shall have a 1/4" Headphone jack for monitoring.
It shall provide an output of up to 12A rms on output A, for one loop with optimum loop field strength. When both outputs A and B are used, each output will supply up to 10A rms.
It shall be compatible with either US or international power systems with the appropriate power cord.
The loop amplifier with the ethernet jack shall be the Williams Sound model PLA DL 210 NET.
The loop amplifier with the ethernet jack and Dante jack shall be the Williams Sound model PLA DL 210 NET D.



2U rackmount, 19" W x 3.5" H x 12" D.  Chassis is 17" W.


14.3 lbs (6.5 kg)


Case: Black, white and blue legends on front, white legends on back.   LCD: Backlit Blue.

Fan Cooling

Variable Speed, Temperature Controlled


100-240 VAC, 50/60 Hz, 500 Watt

Heat Output

Sleep state: 83 BTU

Idle State: 112 BTU

Driving two loops @9A each: 286 BTU

Digital Input

(1x XLR); AES or EBU; 44.1kHz/48kHz

(1x RJ-45); Dante; 44.1kHz/48kHz

Analog Line Inputs

(1x RCA, L+R);  -10dBV, 10kΩ input impedance

Mic/Line Inputs

(2x Phoenix Terminal Block); balanced or unbalanced. 

Input impedance: 1.5kΩ Mic, 10kΩ Line.

Configurable/accepts Mic, Line +4dBu, Line +8dBu, or Line -10dBV.

70-100v Input

(1x Phoenix Terminal Block); speaker-level input, for distributed audio systems.

Line Outputs

(2x Phoenix Terminal Block); loop-through of Mic/Line inputs 1 & 2. +4dBu.  Balanced or Unbalanced.

Loop Outputs

(2x Phoenix Terminal Block).

Required Loop Resistance

0.5Ω to 1.5Ω (DC)

Output Current (Loop)

One Loop, Output A or B: 12A rms. 

Two Loops, Outputs A and B: 10A rms each

Output Power (Speaker)

50 Watts X 1 Channel @ 4 Ω (35 Watts @ 8 Ω).  Class D.

Loop Frequency Response

100Hz to 10kHz @400mA (Output A or B)

Speaker Frequency Response

20Hz - 20kHz (Output A)

Speaker Dynamic Range

>90 dB; A-weighted, typical

Speaker THD+N

0.07%; 50 watts into 4Ω @ 20-20kHz

Loop THD

<1% at nominal power output, 1kHz sine wave

Front Controls

Front LCD display menu access/adjustment via control dial.

Remote Control/Configuration

Ethernet, USB, RS-232.  Application “PC Mixer App" supports all 3 protocols.


Standard RJ-45 jack.


Standard RJ-45 jack.


Standard DB-9 COM port connector.


Standard-B jack. USB 1.1, 2.0 or 3.0 supported.


2 years


CE, UL, ULC, FCC, Industry Canada, RoHS, WEEE, CB scheme


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