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To compensate for the steep decline in hearing sensitivity below 100\u2009Hz, prior to the loudness match, subjects adjusted the relative levels (\u0394L) of the TTC components to give maximum beat perception. Twenty-four normal-hearing subjects were tested. The values of \u0394L giving best beats were well predicted from the transfer function of the middle ear and the estimated shapes of the auditory filters, assuming that the auditory filter whose output dominated the beat percept was centered somewhat above fc. At the same root-mean-square level and independent of fc, TTCs were perceived as louder than UTs for fb \u2264 2\u2009Hz, had roughly equal loudness to UTs for fb\u2009=\u20095\u2009Hz, and were less loud than UTs for fb\u2009=\u200912\u2009Hz.<\/jats:p>","DOI":"10.1121\/1.5121700","type":"journal-article","created":{"date-parts":[[2019,8,14]],"date-time":"2019-08-14T18:01:04Z","timestamp":1565805664000},"page":"1142-1149","update-policy":"http:\/\/dx.doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["On the loudness of low-frequency sounds with fluctuating amplitudes"],"prefix":"10.1121","volume":"146","author":[{"given":"Carlos","family":"Jurado","sequence":"first","affiliation":[{"name":"Escuela de Ingenier\u0131a en Sonido y Acustica, Universidad de Las Am\u00e9ricas , Avenue Granados and Colimes, Quito EC170125, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dar\u00edo","family":"Gordillo","sequence":"additional","affiliation":[{"name":"Escuela de Ingenier\u0131a en Sonido y Acustica, Universidad de Las Am\u00e9ricas , Avenue Granados and Colimes, Quito EC170125, Ecuador"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian C. 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