Small Room Loop Amplifier

PLA 240

The PLA 240 is able to supply living quarters or small conference rooms up to approx. 540 sq. ft. (50 sq.m) with inductive audio signals via the loop connected. The system includes 120 ft. (37 m) induction loop wire. In addition to settings for basic volume and tone, the digitally controlled induction loop amplifier uses Automatic Gain Control to stabilize the volume for fluctuating input levels. The device is able to accommodate the connection of up to 5 audio sources. The desired source can be selected at the touch of a button.

Not available for purchase in all markets.


System Includes

(1) PLA 240 Amplifier
(1) Power supply with line cord
(1) Mic with 1.2 m. cord
122 ft. (37 m) of 18 ga standard wire (0.75 mm²) and Cable clips
(1) RCA Audio Input Cable


  • Magnetic signal couples directly to hearing aids equipped with telecoils (T-Coils)
  • Headphone output for monitoring audio output
  • Can be used with optional loop receivers
  • Mic, line and digital inputs
  • Automatic gain control
  • Volume and tone controls
  • Loop status light
  • Compact and lightweight

Not available for purchase in all markets.

How It Works

The Williams Sound small room loop system readily accommodates individuals with hearing difficulties. In this example, the loop system picks up the sound from a TV program from a direct source connection like a cable box. (The supplied external microphone could also be used by attaching it to the TV speaker). The amplifier transmits this audio directly and clearly to a listener’s hearing aid equipped with a T-coil. The listener’s hearing aid can receive the audio when they are within the perimeter of the loop wire.

PLA 240


7” W x 1-5/8” H* x 6” D** (17.8 cm W x 2.86 cm H* x 15.24 cm D**)

*Height without rubber feet. Rubber feet add 1/8” (0.32 cm)

**Depth includes front controls and rear jacks


Shipping weight (boxed with accessories): 4.3 lb ( kg)

Unit (amplifier) weight: 1.6 lb ( kg)




Unit Input: 12-24 VDC, 2 A

Power Supply Output: 18 V, 1.5 A


Rotary Volume Control,

Rotary Tone Control

On/Off Power Switch

Source Selector Switches

Priority Switch

Input Connections:

Digital Audio TOSlink/Coaxial

2 x Microphone inputs. 3.5 mm mono jack plug. DC powered 5 V for Electret Microphones.

2 x Aux In Left/Right Line Inputs. Phono/RCA jacks. For direct connection to a TV sound output or other sound source.

Output Connections:

Push grip connectors for loop cable (labelled: “loop cable”). Loop will give full output with loop resistance between 0.5 and 1.5 ohms.

Loop output:

3.0 A output current @ 100 Hz – 5 KHz. Meets BS EN60118-4: 2006 for a loop not exceeding 6.5 m (20 ft) in width. Suitable for areas up to 540 sq. ft (50 m2).

Loop cable:

Single turn loop cable. System supplied with 40 m (130 ft) of 24 ga/0.2 mm (0.75 mm2) single core PVC insulated cable. Min cable length 36 ft (11 m) = 0.5 ohms.


Blue/Red LEDs


2 Years


2 Years

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