As was common at the time, the 75mm ( 3 " ) high frequency unit was a miniature version of the woofer, and was mounted onto the grille assembly, so fitted neatly into its own foam lined cavity on the face of the 60 litre bass enclosure.
2.
Although no difference was found for low frequency units, the sex differences in mid and high frequency unit response suggest that there may be a neural basis for male " Co " note selectivity in the amphibian papilla, and for female Qui note selectivity in the basilar papilla.
3.
Of the three main classes of primary auditory units ( low, mid, and high frequency ), the high frequency units in females are tuned ( maximally sensitive ) to sounds of approximately 2 kHz ( the frequency of the Qui note ), whereas the same units in males appear to be tuned to > 3 kHz.
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