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Item currently unavailable
Original price $546.99 - Original price $546.99
Original price
$546.99 - $546.99
Current price $546.99

PLA 90 Counter Loop Hearing Assist System by  Williams AV 

Contact Promax AV for a special order via email at or call us at 604-299-6690, if the item is "Item Currently Unavailable." 


The PLA 90 Counter Loop Hearing Assist System by Williams AV is a portable induction loop system that takes a microphone audio source and sends the audio to the Telecoil (T-Coil) in a patrons hearing aid. This system helps to make your location for accessible for the hearing impaired.

The PLA 90 is well suited for:

> bank teller windows,

> information desks,

> store counters,

> and anywhere customers/visitors need to hear what is being said. 

The PLA 90 picks up external voices with an integrated microphone or with an optional external microphone. The system transmits the spoken word directly and clearly to a listener’s hearing aid equipped with a T-Coil. Designed to meet ADA accessibility requirements.




System Includes

(1) Counter Loop
(1) Rechargeable 10x AA NiMH battery pack
(1) TFP 044 International Power Supply


  • Users bring their own device (hearing aid with T-Coil)
  • No charging or maintaining of receivers by the venue
  • Magnetic signal couples directly to hearing aids equipped with telecoils (T-Coils)
  • Headphone output for users without a hearing aid
  • Can be used with optional loop receivers
  • Can be portable or permanently installed
  • Built-in microphone
  • Optional external microphone
  • Battery or AC powered
  • 3-4 ft. (1m) range
  • Auto shut-off on battery power
  • Meets ADA / ADAAG guidelines

Not available for purchase in all markets.

How It Works

Compact and easy to use, the Williams Sound counter loop readily accommodates individuals with hearing difficulties. The counter loop system picks up a person’s voice from the rear integrated microphone (or an external microphone can be used) and transmits the speaker’s words directly and clearly to a listener’s hearing aid equipped with a T-coil. The listener can pick up the audio when they are within four feet of the counter loop system. This technology allows private conversation while maintaining moderate voice levels.


PLA 90 architectural and engineering specifications

  • The Williams Sound Counter Loop shall be housed in a plastic enclosure and can be placed on a service desk or mounted onto a wall or under a counter.
  • It shall have a range of 3 – 4ft and work with T-coil equipped hearing aids.
  • The Counter Loop shall have a built-in 12VDC rechargeable battery pack that will last up to 6 hours when given a full 3 hour charge. It shall be able to operate off AC power through the same battery charger.
  • It shall have a built-in microphone on the back of the unit and have an additional 3.5mm phone jack for optional external electret microphone. There shall be a gain control for adjusting the external microphone input.
  • There shall be indicator LED’s for power on, battery charging and input signal to the induction loop.
  • The Counter Loop shall be covered by a two-year parts and labor warranty. 90 days on accessories.
  • This shall be the Williams Sound model PLA 90.

PLA 90

Enclosure: Silver Plastic
Dimensions: H 7.9″ (200mm) x W 7.3″ (185 mm) x D 2.9″ (75 mm)
Weight: 1.4lb (635g) with batteries
Range: 3 – 4ft (1 meter)
Microphone Sensitivity: 60dB for full output (internal microphone)
Controls: Power on and power off

Rotary microphone gain for external mic.

Three position Microphone selector switch, internal, external or internal plus external microphones

Auto Power Off: 2 minute timeout if no audio from internal or external mic while using battery only
Indicators: Red LED flashing indicates charging battery

Green LED indicates system operating

Amber LED indicates audio input is being received

Input: 3.5mm mono jack for external microphone
Output: 3.5 mm stereo headphone
Power supply: Universal 100 – 240VAC 50/60Hz input, 16VDC, 1A output, center positive
Battery: 12VDC, 1300mA/h NiMH (10 AA cell pack)
Battery life: 6hrs with full 4 hr recharge time
Loop output power: Max 10W,internal loop coil
Approvals CE, RoHS, WEEE
Warranty 2 years parts and labor (90 days on most accessories)


2 Years