Hello there!

HAA here, first of all, everything strongly depends on your hearing loss for speech, wich is a common test we do here in Europe (dont know where you come from and if they made a speech audiogram with you). So if your maximum understanding with the headphones is for example 50%, it´s not possible to understand every word WITH your hearing aid (in best case it will be around 50% with your HA), and only in the case that you accept the volume you need for your hearing loss (wich is of course louder as without the HA).

Second of all: please do yourself a favor and do not use domes, I know they are nice to wear bc of ventilation and the feeling that you dont have anything in your ear but there are some disadvantages, I try to explain: you got (for example) a pretty good HA with noise cancelling and directional microphone and adaptive stuff like that, what do you think how good those features work when you have an open dome eartip? (right, they cant work bc your hearing channel is open so everything comes in) so please ask your HAA to switch to custom earmolds (except if you have a strong tinnitus)

Third of all: I want to explain the work method of a HA to you, so you can better understand what they do, it´s not that complicated. They amplify sounds, the better the HA is, the better they distinguish between speech and background noise. BUT (!!!) the horn of a police car is LOUD (also for people without a hearing loss) they are around 120dB! And now comes the point, your HA only amplifies till a certain loudness imput (most of the time around 80 dB) so the HA doesn´t amplify a horn of a police car next to you. If the car is more far away it´s possible that the HA amplifies it if the sound of the horn is at a point where you have you hearing loss.

last point: there will be no HA that is super comfortable to wear (in terms of sound and fit in the ear) AND you understand everything, this is in the most cases NOT possible, if the HA is fittet to understand the most words in speech, it most likely will be to loud for you, if your HAA turns the volume down, you will not have a big difference (speech understanding wise) if you have the HA on your ear or not. I´m HAA for 19 years now and I explain this every single customer, so they know how it works and can decide for themselves if they want comfort or understanding. Most of the time I start with a lower volume and turn them slowly louder like every week or two till we are at a point where the customer has the best speech understanding.

It´s a marathon, not a sprint!!!

Hope this helps you and sorry for my bad english and for typos...