Effect of the bandwidth of high-frequency sounds (>8 kHz) on loudness

The effects of the bandwidth of high-frequency sounds on loudness are investigated. Loudness matches are obtained using a two-interval, adaptive forced-choice procedure converging on the point of subjective equality by following a simple 1-up, 1-down rule. Loudness increases significantly when the sound has a 1/3 octave band compared with smaller bandwidth sounds, confirming the effect of bandwidth of high-frequency sounds.