My hearing is shot above 9.5kHz as well, but I can hear bass very clearly. For example, I can hear my mother-in-law coming rumbling from more than 300 meters.
Gives plenty of time to deal with that fight or flight reaction!
I have a dip from 8-10k, then tinnitus masks from 10k-12k, picks up again at 12k then gone by 15k...
Lower frequencies are comparatively decent...