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Question: Using loudness contours ISO 226, 2003), which of the above two frequencies is loudness growth greater for a normal hearing listener with thresholds of 0 dB HL at audiometric frequencies: 50 dB SPL tone at 125 Hz or a 40 dB SPL tone at 1000 Hz? Explain
your choice. The loudness growth is greater for the 50 dB SPL tone at 125 Hz. This is because according to ISO 226, a 50 dB SPL tone at 125 Hz has a loudness of about 54.4 sone, whereas a 40 dB SPL tone at 1000 Hz has a loudness of only about 12.7 sone. Sone is a unit of loudness, and therefore the higher the sone value, the louder the sound.
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