Hearing aid parts & components

Earmoulds, transducers, filters & more

Interesting facts about hearing aid parts and replacements

Do you know what a hearing aid is? And how many parts is it made of? And how does it work?Find out by reading this article: we will explain to you what the filters, the microphone, the headset and all the other components of a device are.

Overview of hearing aid models

Hearing aids were designed to guarantee the best possible listening experience. There are three different types of hearing aids:

Parts used in all hearing aids

Not all hearing aids are made of the same components. However, we can say for certain that there are parts that can never be missing in this device, such as the microphone, earphones, amplifier and batteries.

Hearing aid case

Each hearing aid has its own case. Each case, or box, serves to store and protect all the components of the hearing aid. There are different types, some are even waterproof. The main function of the case is to ensure the transportation of the device in total safety.

Microphone or transducer

The microphone is one of the necessary components of any hearing aid; its goal is to collect sounds and limit background noises so that patients can enjoy clear and easily distinguishable sounds. This component is closely connected to the speaker which will return the sound to the person according to their hearing needs.

The latest generation devices are equipped with "directional" microphones: these are special microphones capable of picking up sounds from any direction they come from; there are different types:

  • fixed omnidirectional
  • fixed directional
  • adaptive directional

The first type is recommended if the patient is in a quiet environment, engaged in home activities that also include listening to the radio or TV; the second group is indicated for enhancing the sounds arriving from the front; finally, the adaptive microphones are able to manage the two types of microphones (directional and omnidirectional) automatically.


The headset is closely connected to the microphone: thanks to the synergistic work of the headset and microphone, we can enjoy a great hearing experience, both internal and external.


The amplifier is another necessary element of a hearing aid: this component makes it possible to increase the sound perceived by the microphone which is then projected through the earpiece.

In this process, the amplifier increases the range of action of the sound. But not all sounds are increased indiscriminately: in fact the amplifier, also called microprocessor, based on appropriate adjustments, processes only certain sounds and, subsequently, projects them to the eardrum. The hearing aid is a small PC, which enhances some sounds and eliminates others, as is the case of background noise.

Batteries (battery box)

Each hearing aid has a battery compartment; most modern appliances usually work with button batteries. Thanks to Amplifon technology, some hearing aids are rechargeable and can last up to 24 hours.

Optional hearing aid parts

After describing the necessary parts of the hearing aids, let's move on to the optional parts. However, we must specify that these are not truly optional elements because, in some cases, these are parts key to the hygiene of the device and in others, the individual components serve to improve the listening experience.


Some hearing aids allow a certain level of customization: for example, otoplastics adapts to the inner ear of the patient who will wear them.

Hearing aid filters

The filter serves to protect the device from external agents such as earwax, dust and dirt; using filters and wax guards will prevent this debris from clogging and damaging the entire hearing aid.

Hearing Aid Domes/Umbrellas

The domes are disposable earphones placed on the speaker of the device. These are fundamental tools for acoustic comfort; they can wear out quickly and replacing them ensure its hygiene and offers a better listening experience.

Sound tube

This is a special tube used to connect the earpiece to the hearing aid; it is advisable to replace it approximately every three months. Failure to replace it can compromise correct acoustic transmission and can cause pain and whistling caused by the return of sound.


The magnetic induction system is suitable for those who use a hearing aid with telephone coil, telecoil. Through the coil, magnetic energy is converted into electrical energy and then amplified into a high-quality playback signal. This allows you to receive the signal directly from a microphone or a TV, avoiding the problem of distance, reverberation and ambient noise.

Bluetooth connection

The bluetooth connection allows the hearing aids to connect to a smartphone. This way, the patient will be able to listen to the audio coming from a phone call or the music directly from his / her mobile phone.

Hearing aid spare parts

Spare parts for hearing aids are very important and some components need to be replaced periodically, such as the tube and batteries. We recommend you visiting the closest Amplifon centre to find out everything you need to know about your hearing aid.

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