A practical guide from Hearing Healthcare Practice.
We posted recently about the importance of words when it comes to hearing loss. Which led us to reflect on the fact that hearing aids come with their own language, some of which can be confusing. Depending on our clients’ wishes we’ll often explain these elements of hearing technology during appointments but here, for everyone, is our brief guide. We’ll be taking a ‘deeper dive’ into more hearing and hearing loss related language in another article.
Some of the terms below describe essential technology. Others describe comfort, connectivity, or listening performance. Understanding these words helps you ask better questions and feel more confident about your hearing care decisions. This guide explains common hearing aid terms in clear, everyday language, some my seem obvious, other less so!
So let’s start with the ‘basics’ – although in the latest hearing technology, these are very far from basic!
Hearing Aid Microphone
The microphone is the part of the hearing aid that captures sound from the environment. It converts acoustic sound waves into electrical signals that the device can process. Modern hearing aids often use multiple microphones working together to improve speech clarity, reduce background noise, and help you focus on sounds coming from specific directions. Microphone quality strongly influences how natural and comfortable amplified sound feels.
Amplifier
The amplifier increases the strength of incoming audio signals so they can be heard more easily. In digital hearing aids, amplification is not simply “making things louder.” The system selectively boosts frequencies based on your hearing profile. Soft sounds can be enhanced without over-amplifying louder ones. Advanced amplifiers constantly adjust levels in real time, helping maintain listening comfort across changing environments such as quiet rooms, busy streets, or group conversations.
Receiver (Speaker)
The receiver, sometimes called the speaker, converts processed electrical signals back into sound. This sound is delivered into the ear canal through a dome, mould, or custom earpiece. Receiver design affects clarity, loudness range, and overall sound quality. Some hearing aids place the receiver inside the ear canal for a lighter feel, while others house it within the main casing for durability and easier maintenance.
Digital Signal Processing (DSP)
Digital signal processing is the brain of a modern hearing aid. DSP analyses incoming sound thousands of times per second, separating speech from noise and adjusting amplification precisely. It can reduce sudden loud sounds, manage feedback, enhance speech cues, and balance tonal quality. Without DSP, hearing aids would function like basic amplifiers. With it, devices deliver a more refined, adaptive listening experience tailored to your hearing needs.
Hearing Aid Directional Microphones
Directional microphones help prioritise sound coming from a chosen direction, usually in front of the listener. This is especially helpful in noisy settings like restaurants or meetings. The hearing aid uses timing and level differences between microphones to reduce competing sounds from behind or the sides. While not a substitute for good acoustics, directional systems significantly improve speech understanding in challenging listening situations.
Noise Reduction / Noise Management
Noise reduction systems identify unwanted background sounds and soften them without removing important speech signals. These algorithms distinguish steady noises such as traffic, air conditioning, or crowd ambience from dynamic sounds like voices. The aim is listening comfort and reduced fatigue rather than silence. Effective noise management makes everyday environments feel less overwhelming while preserving awareness of surroundings for safety and natural hearing balance.
Feedback Management
Feedback is the whistling sound that occurs when amplified audio leaks out and is re-amplified by the microphone. Feedback management systems detect and suppress this loop instantly. Modern hearing aids use phase cancellation and predictive modelling to control feedback without lowering overall volume. This allows for open-fit designs, greater comfort, and stronger amplification while minimising the risk of distracting squeals during normal use.
Programmes / Listening Modes
Programmes, sometimes called listening modes, are preset configurations designed for different environments. Examples include quiet conversation, music, speech in noise, or outdoor listening. Some programmes are manually selected, while others switch automatically using environmental detection. These settings adjust amplification, microphone directionality, and noise reduction behaviour. Properly configured programmes allow hearing aids to adapt smoothly as your listening demands change throughout the day.
Bluetooth / Wireless Connectivity
Bluetooth connectivity allows hearing aids to link with compatible phones, tablets, televisions, and accessories. Audio streams directly into the devices, improving clarity for calls, media, and video content. Wireless systems also enable remote adjustments and app-based controls. Connectivity features enhance convenience and listening flexibility, though compatibility varies by manufacturer and device generation. We will ensure everything is paired and performing at your fitting appointment.
Hearing Aid Telecoils (Loop System)
A telecoil is a small component that receives electromagnetic signals from hearing loop systems installed in many public venues. Instead of amplifying surrounding noise, the telecoil picks up sound directly from the source, such as a theatre microphone or service counter. This often improves speech clarity in echo-prone spaces. Telecoils remain a valuable accessibility feature despite growing popularity of wireless streaming technology.
Rechargeable Batteries
Rechargeable hearing aids use built-in lithium-ion or silver-zinc cells instead of disposable batteries. Users place devices in a charging dock overnight. Benefits include ease of handling, reduced waste, and predictable daily power. Battery life depends on streaming use, amplification demands, and age of the cell. Rechargeable systems suit many users, particularly those who prefer not to manage frequent battery changes. All new hearing aids available at Hearing Healthcare Practice are rechargeable.
Disposable Batteries
Disposable batteries do remain widely used and are available in several standard sizes. They offer flexibility for travel and quick replacement without charging. Battery lifespan varies with device power requirements and daily usage. Some users prefer disposables for convenience or reliability in extended listening situations. Proper storage and handling are important to maintain performance and avoid premature depletion.
Domes and Earpieces
Domes are soft tips that sit in the ear canal, while custom earpieces are moulded for an individual fit. Both guide sound into the ear and influence comfort, retention, and acoustic seal. Open domes allow natural sound entry, while closed designs improve amplification efficiency. Correct sizing prevents discomfort, feedback, and sound leakage. Regular inspection and replacement maintain hygiene and audio quality.
Wax Guards / Filters
Wax guards are tiny protective barriers that prevent earwax and debris entering the receiver. Blocked filters reduce sound output and clarity. Regular replacement is part of routine maintenance. Modern designs are discreet and simple to change with provided tools. Proper wax guard care protects delicate components, prolongs device lifespan, and helps preserve consistent hearing performance.
Open Fit vs Closed Fit Hearing Aids
An open-fit hearing aid allows some natural sound to enter the ear alongside amplified sound. This often improves comfort and reduces the sensation of blockage. Closed-fit systems create a tighter seal, enabling stronger amplification for greater hearing loss. Each approach has acoustic advantages. Selection depends on hearing levels, ear shape, and listening preferences determined during professional assessment.
Real Ear Measurement (REM)
Real ear measurement is a clinical verification process used during hearing aid fitting. A tiny probe microphone measures the sound delivered inside your ear canal. This confirms amplification matches prescribed targets rather than relying on estimates. REM improves accuracy, comfort, and speech clarity. It is considered best practice in audiology and ensures hearing aids perform as intended for your hearing profile.
Compression
Compression automatically adjusts amplification based on input sound levels. Soft sounds receive more boost, while louder sounds are controlled to prevent discomfort. This maintains a usable listening range across varied environments. Without compression, everyday sounds could feel either too quiet or uncomfortably loud. Properly configured compression supports speech understanding, listening comfort, and natural sound perception.
Why understanding Hearing Aid terminology matters
Knowing these terms can help our clients communicate more effectively with their audiologist. Hearing technology continues to advance, but clear explanations remain essential. At Hearing Healthcare Practice, we believe clients should be well informed to what ever level they feel happy – some people don’t want to know too much!
Need advice on hearing aids in Harpenden?
If you have questions about hearing aids, fittings, adjustments, or maintenance, our audiology team is here to help. We offer personalised assessments, expert guidance, and ongoing support to keep you hearing comfortably and confidently.
Call us on 01582 767218 or CLICK HERE to make an appointment.