A.250Hz B.500Hz C.1000Hz D.3000Hz E.5000Hz
A.0~120Hz B.0~20Hz C.20~2000Hz D.20~20000Hz E.20~120Hz
A.20dB SPL,120dB SPL B.0dB HL,120dB HL C.0dB SPL,100dB SPL D.20dB SPL,85dB SPL E.0dB SPL,120dB HL