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Question: Use ISO 226, 2003 to answer. For a normal hearing listener with thresholds of 0 dB HL at audiometric frequencies, which would be perceived as louder, a 50 dB SPL tone at 125 Hz or a 40 dB SPL tone at 1000 Hz. Explain your reasoning.
The 50 dB SPL tone at 125 Hz would be perceived as louder because it is at a lower frequency, and the sensitivity of the ear at low frequencies is increased. According to ISO 226, 2003, the equal-loudness contours for normal hearing listeners show that the threshold for 125 Hz is about -5 dB HL, whereas for 1000 Hz it is around 0 dB HL, or the same as the 0 dB HL thresholds reported for normal hearing listeners. This means that a sound of 50 dB SPL at 125 Hz will be perceived as much louder than a sound of 40 dB SPL at 1000 Hz.
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