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Figure 1*: Normal equal-loudness-level contours for pure tones under free-field listening conditionsaccording to ISO 226:2003 (Permission for publication kindly granted by ISO) * It should be noted that free-field (binaural) thresholds given in the figure are different from headphone thresholds; the differences depend on the headphone type and frequency tested (BS EN 60645-1:2001*IEC 60645-1:2001; BS EN ISO 389-2:1997) Source: SCENIHR,
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