Phonak doesn’t publish their input headroom, but I read an article last year that The Audeo Marvel (predecessor to Paradise) had input of 99dB, which would account for distortion!
The Oticon OPN1 and OPN S1 are rated at >109dB.
I believe the Widex and Starkey are also in line with Oticon,
Here’s the post:
menglxs
China
Terost
You can find the specification for More in this document：
wdhecomcdn1.blob.core.windows.net
222836UK_TD_Oticon_More_miniRITE_R.pdf
1333.87 KB