.
Speech Discrimination Rt = 88% at 65 dB, Lt. = 60% at 80 dB

Hz. Lt Rt

250 25 25
500 25 20
1K 20 10
1.5K 65 15
2K 65 35
3K 60 60
4K 70 55
6K 75 60
8K 70 70