SPHR 4/588 - Advanced Audiology
dB HL Tutorial

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Perform each of the five following conversion problems. The ANSI reference values for Audiometric Zero (i.e., dB HL) are shown below.

3. A threshold at 250 Hz is obtained at 5 dB HL. What would this equal in dB SPL:  


 

Frequency (Hz.)
125
250
500
1000
2000
3000
4000
6000
8000
TDH 49,59
47.5
26.5
13.5
7.5
11.0
9.5
10.5
13.5
13.0