This is correct. Although I would say amplitude or intensity, rather than loudness: for loudness itself is a function of intensity and frequency. At least for

This is correct. Although I would say amplitude or intensity, rather than loudness: for loudness itself is a function of intensity and frequency. At least for pure tones that aren't too high, most listeners perceive a pitch drop at higher intensities. Both in the Journal of the Acoustical Society of America: S.S. Stevens, "The relation of pitch to intensity", Vol. 6, 1935, pp. 150-154. http://asa.scitation.org/doi/10.1121/1.1915715 http://asa.scitation.org/doi/10.1121/1.1915715 W.B. Snow, "Changes of pitch with loudness at low frequencies", Vol. 8, 1936, pp. 14-19. http://asa.scitation.org/doi/10.1121/1.1915846 http://asa.scitation.org/doi/10.1121/1.1915846