Dropping the 1800 Hz
The BTE has been changed to have 900 Hz, one program with low frequency emphasis and one without (neutral). The latter sounded soft so the volume was increased compared to the program with low frequency emphasis.
Life as a bilateral cochlear implant recipient. If the topic is new to you, check out this background information on cochlear implants; while the article is somewhat dated (1998), it does cover a fair amount of history.
My opinions are my own, unless they would get me into trouble; in that case I don't know whose they are.