Large-area DSP induction loop system with network control

Product Highlights

  • 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) - multiple options offer greater flexibility
  • Meets IEC Specification 60118-4


The Digi·Loop induction loop system is the first of its kind to maximize modern amplifier technology.  DSP audio processing offers flexible, powerful software control of mixing, equalization, compression, loop phase shift and more.  Powerful Class D, pulse-width amplifiers maximize efficiency, and reduce size and weight.  And network control capability provides seamless, remote system set-up, operation and monitoring via laptop, tablet or other portable device.  The Digi-Loop’s dual-amplifier design offers flexibility, with the option of single 12A output for perimeter loops or dual 10A outputs for loop arrays or one loop and one loudspeaker.  Priority input (70-100V) is also available for connection to a paging system, ensuring life/safety announcements are heard loud and clear.  And Digi-Loop is the only loop amplifier to offer an easy-to-read LCD graphic display.

System Includes

(1) PLA DL 210 NET DSP Induction Loop Amplifier
(2) PLR BP1 Body-Pack Receivers
(2) EAR 022 Surround Earphones
(1) BAT KT6 Dual Drop-In Charger Kit
(1) IDP 009 ADA Wall Plaque (T-Coil)
IEC 60118-4
Pla dl210 sys 1


  • Crestron® control
  • DSP Audio Processing
  • Digital Inputs - AES3/EBU
  • 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


EAR 013


3.5 mm mono

Cord length

39 inches


32 Ohms

Frequency Range

20 - 20kHz

Max input power



128dB @ 1kHz

Driver size

13 mm



Replacement earpad

EAR 015

IDP 009

10-3/8" (L) x 6-¼" (W) x 1/8" (H)

PLA DL210 NET 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

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 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

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 Williams Sound 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 covered under a 5 years parts and labor warranty.
The receiver shall be the Williams Sound 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


Accessories for Large-area DSP induction loop system with network control [PLA DL 210 SYS 1]

BAT KT6 Charger kit for body-packs, 2-bay

EAR 013 Single mono earbud

EAR 013 T Single Mini Earphone w/ Eartip

IDP 009 ADA Wall Plaque (T-coil)


Download/View Name Type Language
Induction Loop Certification Form (IEC 60118-4) Supplements English
LOOP Hearing Assistance System MasterFormat Specs English
White Paper - Crestron Control of DL210 Loop Amplifier White Papers English
Induction Loop System Design Design Guides English
Loop Brochure - High Res Brochures English
Loop Brochure - Low Res Brochures English


Name Description Duration
Williams Sound: Induction Loop Installation

This video shows a typical loop installation in a conference room.