'ambient' is just another word for 'background' ...
i have some of that even with one hearing aid .. but its easy enough to change if i take the hearing aid in and it get it fine tuned.
although, sometimes at my daughter's elementary school i can hear people and noise in the hallways with the door shut better than i can hear whats going on in the classroom where i am sitting. its very, very distracting and i think it has to do with the way i hear now; some of the tiny hairs dont pick up sound anymore, so the ones that still do.. pick up as much as they can to offset..
or something like that..