Assistive Listening

Metro Sound Pros is the largest Assistive Listening Device Installer in the country!


With several Manufacturer alliances worldwide, MSP has the technology in hand to solve the toughest Assistive Listening challenges. From Houses of Worship and Museums to Colleges and Retail facilities, there is NO LIMITATION to where we can install Assistive Listening devices. No matter if it's a simple room loop or a very advanced auto-switching multi-zone FM system MSP's design specialists and integrators can get the job done. Let MSP get your establishment up to current ADA standards. All of MSP's Assistive Listening technologies comply with each of the technology's standards. MSP is a proud supporter of hearing loss communities throughout the country.


Audio Frequency Induction Loop Systems (AFILS) aka Hearing Loops

Hearing Loop T Coil

Induction Loop technology uses magnetism to reproduce a room's audio output. The Induction Loop signal is picked up by a small coil of wire inside hearing aids and or cochlear implants, called a T-Coil. The T-Coil uses low electricity minimally affecting the battery life of the hearing aid or cochlear implant. The sound is mixed and adjusted by the hearing aid to compensate for the users hearing loss, giving as close to true sound reproduction as possible within an assistive device.

T-Coil equipped device users with loop systems enjoy crystal clear customized sound without wearing another complicated device that needs charging and or batteries. An Induction Loop system eliminates background noise and echo by sending the audio signal directly to the end user. To the listener, it sounds like the speaker is sitting on their shoulder, talking directly in their ear!

Loops are more likely to be used than other assistive listening systems because they do not require additional hardware. They can make a profound difference in the lives of the hard of hearing and can be installed anywhere there is amplified audio.

Please visit our downloads section for our Induction Loop Questionnaire which will help us get started developing a system to fit your needs.


FM Broadcast Technology

T Coil FM Hearing

In principle, FM systems designed for hearing assistance application work just like commercial FM broadcast systems operating in the 88 to 108 MHz range. However, in the United States, the FM systems operate at FCC-designated frequency bands in the range from 72 to 76 MHz and from 216 to 217 MHz. The 72 to 76 MHz band is used for both personal and commercial applications. The 216 to 217 MHz band is intended for auditory assistance applications only. Since each system may use its own broadcast frequency, several systems can operate simultaneously at one location without interfering with one another. However, unlike the loop system, the FM system requires a special receiver for each person, whether they have a hearing aid or not. There are several listening options available for FM receivers. The most convenient for public facilities are the under-the-chin type headsets or Walkman-style headsets and the neck loops (personal induction loops) for T-coil users.

The 72 to 76 MHz band used for commercial applications can be split into 40 narrow-band channels or 10 wide-band channels. Narrow-band systems are less susceptible to radio interference than wide-band systems but receivers are generally more expensive. MSP carries both narrow-band and wide-band systems. To alleviate potential interference problems with wide-band systems, all systems carried by MSP feature field tuning to any wide-band channel.



Infrared HearingInfrared light can be used for signal transmission in the same fashion as with FM transmission. An infrared system consists of three basic components: a transmitter (base station), an emitter, and a receiver. The audio signal is conveyed onto a sub-carrier in the base station which in turn is converted into infrared light by the emitter. There are four sub-carrier frequencies used for hearing assistance systems: 95 kHz, 250 kHz, 2.3 MHz, and 2.8 MHz. The receiver detects the IR signal and converts it back into the original audio signal. However, unlike FM transmission and induction loop technology, infrared light cannot pass through walls. Therefore, infrared light transmission is ideal for facilities operating several systems simultaneously in different rooms in that all receivers can be identical with no need for frequency coordination. As with FM technology, each person must use a receiver, whether or not they have a hearing aid. Receiver types include lightweight under-the-chin style, over-the-head receivers for 360-degree reception, and lapel style. The same listening options are available for the lapel-style receivers as for the FM receivers.


Closed Captioning

Closed captioning allows end users to have access to videos by displaying the audio portion of a video program as text on the screen. Closed captioning provides a critical link to information for individuals who are deaf or hard of hearing. For individuals whose native language is not English, English language captions improve comprehension and fluency. Captions also help improve literacy skills. But, do note closed captioning can be created in any language.

Metro Sound Pros has the ability to take any pre-recorded content and add in closed captioning. Call us today for a free estimate to have your content captioned.


Metro Sound Pros is proud to offer a discount on our Assistive Listening installation services to all non-profit Hearing Loss organization donors. Contact us for more details!