[slwiser]

30hz: -48dB
12khz: -48dB
16khz: -12dB

Elsewhere I do well up to between 14 and 15 kHz then it goes straight up to the -12dB at 16kHz. It indicates to me that above 15 kHz I have a fair amount of hearing loss. But for someone 56 years old that may not be that bad. I used the instruction rigidly. These are my sound levels where those tones are just beginning to be heard at each frequency. The last time and my best time that I did this was when I used my ATH-ANC7 noise cancellation headphones. This curve compared with previous tests was much smoother across the audio range much like the typical sound profiles you see on the threshold of audibility curves. Only for the audibility curves the scale is inversed on the vertical side.

Be careful that you don't increase the levels to high just to get a reading.