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Question: Using loudness contours ISO 226, 2003 which of the two frequencies has greater loudness growth 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 answer. The 50 dB SPL tone at 125 Hz has greater loudness growth for a normal hearing listener with thresholds of 0 dB HL at audiometric frequencies. This is because the equal loudness contour (ISO 226, 2003) for 125 Hz is much steeper in slope than the contour for 1000 Hz, meaning that the small change in amplitude (10 dB) between the two tones results in a much greater change in loudness for the 125 Hz tone. For the 4000 Hz octave band, a 10 dB increase in amplitude results in only about a 4 dB increase in loudness.
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