Most hearing aid adjustments fall into three categories: changes you can make yourself using physical controls or a smartphone app, dome and fit changes that affect sound quality, and professional fine-tuning that requires an audiologist. Knowing which type of adjustment you need saves time and gets you to better hearing faster.
Physical Controls on the Device
Hearing aids use a few standard control types, and yours will have one or more of them depending on the model and size.
A volume wheel is a small rotary dial found mostly on custom in-ear hearing aids. Turn it clockwise to increase volume, counterclockwise to decrease. A rocker switch sits on the body of behind-the-ear models: press the upper portion to raise volume, the lower portion to lower it. These give you quick, tactile control without pulling out your phone.
A push button usually cycles through listening programs rather than adjusting volume. Short taps move you from one preset to the next, such as from a general program to one optimized for noisy restaurants or phone calls. If your hearing aid has only one button, it likely handles both functions: a short press changes the program, while a long press adjusts volume (or vice versa). Your user manual will specify the mapping for your model.
Some newer devices also support tap controls. Double-tapping the side of the hearing aid activates features like instant sound optimization without touching any button at all.
Adjustments Through a Smartphone App
Nearly every major hearing aid manufacturer offers a companion app that connects to your devices over Bluetooth. The app typically gives you more granular control than the physical buttons, including an equalizer that lets you boost or cut sound in different frequency bands, and a background noise reduction slider you can dial up in loud environments like restaurants or public transit.
Most apps also let you save custom presets for specific situations. You might create one for your office, one for watching TV, and one for outdoor walks. Once saved, you can switch between them with a tap or, on some models, set the hearing aid to choose automatically based on GPS location. If your hearing aids came with an app you haven’t explored yet, downloading it is the single easiest way to expand what you can adjust on your own.
How Domes Change What You Hear
The small silicone tip that sits inside your ear canal (the dome) has a surprisingly large effect on sound quality. Swapping dome types is one of the simplest physical adjustments you can make, and many audiologists will give you extras to try.
Open domes have small holes that let ambient sound pass through naturally alongside the amplified signal. They tend to sound the most natural and are common for mild to moderate hearing loss. Closed domes have fewer holes and block more outside sound, which helps when background noise is distracting. Power domes seal the ear canal completely with no holes at all, directing maximum amplified sound inward for severe hearing loss.
If your own voice sounds hollow or boomy, like talking with your head in a barrel, that sensation is called occlusion. Switching to a more open dome often helps because it lets low-frequency sound escape rather than bouncing around in the sealed canal. If an open dome doesn’t provide enough amplification for your loss, your audiologist can adjust the venting in a custom earmold or tweak low-frequency settings in the software to compensate.
Fixing Feedback and Whistling
Whistling happens when amplified sound leaks out of the ear canal and loops back into the hearing aid’s microphone. The most common cause is simply a poor physical fit. Your ears change shape over time, and earmolds that once sealed well can gradually loosen. Reinserting the hearing aid more carefully sometimes fixes it immediately. If it doesn’t, you may need new earmolds made from a fresh impression of your ear.
Volume set too high is the second most common trigger. When you push the level past a certain point, the amplified sound is strong enough to escape and re-enter the microphone no matter how good the seal is. Turning the volume down a notch or two often eliminates the whistle entirely.
Earwax buildup is another culprit. Wax can block the receiver or the vent, redirecting sound back toward the microphone. Keeping your ears clean (professionally, not with cotton swabs) and regularly wiping down the hearing aid’s receiver opening reduces feedback episodes. Most modern hearing aids also have a built-in feedback cancellation system, but it can only compensate so much. It works best as a backup, not a substitute for a proper fit.
When Sound Quality Still Feels Off
If speech sounds tinny, muffled, or uncomfortably sharp after you’ve tried your app’s equalizer and experimented with domes, the issue is likely in the professional programming. Hearing aids are initially set using the manufacturer’s “first fit” algorithm, which estimates the right amplification levels based on your hearing test. Research shows these estimates frequently miss the mark, especially at higher frequencies. In one study, 79% of users preferred the sound after their audiologist verified the settings with real-ear measurements compared to only 21% who preferred the manufacturer’s default.
Real-ear measurement involves placing a tiny microphone probe inside your ear canal alongside the hearing aid, then playing calibrated sounds at different volumes (typically quiet, conversational, and loud levels). The audiologist can see exactly how much amplification is reaching your eardrum at every frequency and adjust the programming to match your prescription targets precisely. Word recognition scores improve significantly with this verification, particularly for soft speech. If you’ve never had this done, or if your hearing has changed since your last fitting, requesting a real-ear measurement appointment is the single most impactful adjustment available.
Remote Fine-Tuning With Your Audiologist
Many hearing aid brands now support remote programming, where your audiologist adjusts your settings over the internet without an in-person visit. You connect your hearing aids to a smartphone app that acts as a bridge between your devices and the audiologist’s fitting software. You describe what’s bothering you (too much background noise, voices sound harsh, music sounds flat), and the audiologist pushes updated settings to your hearing aids in real time or as a downloadable update.
This works well for minor tweaks after an initial fitting, like adjusting gain in a specific frequency range or changing how aggressively the noise reduction behaves. You do need a stable internet connection and a compatible smartphone. Remote sessions can’t replace an in-person visit for everything, particularly physical fit issues or real-ear verification, but they eliminate a trip to the clinic for the kinds of adjustments that come up in the first few weeks of wearing new hearing aids.
Automatic Adjustments in Newer Hearing Aids
Current-generation hearing aids continuously analyze the sounds around you using onboard microphones and processing chips. They measure volume, pitch, and the direction sounds are coming from, then compare what they detect against stored models of common listening environments: quiet rooms, crowded restaurants, outdoor spaces, sudden loud noises. When the environment changes, the hearing aid shifts its settings automatically.
In a noisy restaurant, for example, the directional microphones narrow their focus toward whoever is in front of you while reducing amplification of sounds coming from behind. In a quiet living room, they open up to let you hear everything around you with minimal processing. This happens continuously and in real time, so you don’t need to press a button or pull out your phone every time you walk from one environment to another. If the automatic behavior doesn’t match your preferences in a specific situation, you can override it with a manual program through your app or push button.
OTC Hearing Aids and Self-Fitting
Over-the-counter hearing aids, available without a prescription since October 2022, are designed for adults with perceived mild to moderate hearing loss. The FDA requires that OTC devices allow users to control and customize settings through built-in tools, hearing tests, software, or smartphone apps. Self-fitting models walk you through an in-app hearing assessment and automatically configure amplification based on your results.
The tradeoff is that you’re doing everything an audiologist would normally handle: assessing your hearing, selecting the right amplification profile, adjusting for comfort, and troubleshooting problems. The adjustment tools in OTC devices have improved substantially, but they can’t replicate the precision of real-ear measurement or the trained ear of a professional who can identify why something sounds wrong. If you’ve been adjusting an OTC device for weeks and still aren’t satisfied, a one-time consultation with an audiologist can identify whether the issue is in the settings, the fit, or whether your hearing loss falls outside the range OTC devices are designed for.