I went to several audiologists about two and half years ago and they did audiograms which only went up to 8 khz. The range of human hearing I believe can go up to 20 khz. This left a large difference in what can't be corrected. Some people, I believe, have tinnitus higher than 8 khz that might be helped in ambient noise environments with correction higher than 8 khz. All the audiologists back then told me that they could only program hearing aids up to 8 khz. However, yesterday, I went to an audiologist and he said he was going to install some new testing equipment that will be able to test people's hearing up to 14 khz and he told me that there is a hearing aid he could program up to 12 khz which is the Siemens Binax 7. I do not know if there are any other hearing aids that do this but it may be worth calling around and if so, asking if the audiologist has the capability to test higher than the normal 8 khz audiogram. He also thinks next month, some hearing aid manufacturers will also release some new hearing aids which will have some enhanced features that current aids do not have. I am no scientist so I do not know if this would help or not but I would figure out I could pass this along. Let me guys know if you think this might be worth trying.