I’ve been wearing Whisper hearing aids for the past 3 years. The right ear has been fitted with a closed dome and the left with a power dome, both Phonak domes.
So, recently I did some experimenting on my own. I replaced the domes with a set of Oticon open bass domes just for the heck of it. Wow! What a difference. It’s like I’ve got a new pair of hearing aids. Not only does my own voice predictably sound better and more natural, but speech clarity is noticeably improved as well.