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A 50 dB SPL tone at 125 Hz would be louder than a 40 dB SPL tone at 1000 Hz.

At 1000 Hz, the SPL would be 40 dB higher than at 125 Hz.

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Question: Using equal loudness contours (e.g. ISO 226, 2003) for a normal hearing listener with thresholds of 0 dB HL at audiometric frequencies,at which frequency would loudness growth be greater, a 50 dB SPL tone at 125 Hz or a 40 dB SPL tone at 1000 Hz?

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The 50 dB SPL tone at 125 Hz would have greater loudness growth. According to the ISO 226 equal-loudness contours, a 40 dB SPL tone at 1000 Hz would have a loudness level of approximately 38.5 dB, while a 50 dB SPL tone at 125 Hz would have a loudness level of approximately 53.5 dB.

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Published: Wednesday, December 14, 2022

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