From: Hearing screening for school children: utility of noise-cancelling headphones
Octave band frequency (Hz) | Noise attenuation of noise-cancelling headphones (dB)* | Typical attenuation of TDH-39 supra-aural earphones (dB)** | Difference in noise attenuation level (dB) |
---|---|---|---|
A | B | (A – B) | |
125 | 11 | 3 | 8 |
250 | 11 | 5 | 6 |
500 | 9 | 7 | 2 |
1000 | 23 | 15 | 8 |
2000 | 23 | 26 | −3 |
4000 | 35 | 32 | 3 |
8000 | 33 | 24 | 9 |