Hearing aids do not act like a volume control. Everything will not just sound louder, like when you turn up the TV. Hearing aids are programmed specifically to improve your hearing. They are set up and programmed to compensate for your specific hearing loss. They usually amplify quieter sounds more and louder sounds less, or not at all. You will pick up sounds you had forgotten about as you have been unable to detect them for years.
The sound level and the way hearing aids amplify is constantly changing depending on the listening environment that you are in. They detect the environment and optimise the sound directed to your ears, which helps your brain use the sound information.
It is important we match the right level of technology to your listening needs. Well fitted hearing aids will help you to confidently hear what is said the first time. This means you will not need to keep doing mental calculations to work out what they could have said and no need to ask for repeats.
Most hearing aids will work well in easy listening environments. Higher end hearing aids are able to modify the sound in more detail often giving better sound quality and reduced listening effort for the wearer. Higher end hearing aids give better results in difficult listening environments like noisy and echoey rooms.