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The present study extends the phonological realm of locus equations to include nasals, fricatives, approximants and unas-pirated voiceless stops. The question of interest was to determine if locus equation slopes and y-intercepts could serve as phonetic descriptors for place of articulation across varied manner classes. Fourteen speakers, 7 male and 7 female, produced CVC tokens with 10 medial vowels and initial consonants varying across manner classes. F&lt;sub&gt;2&lt;/sub&gt; onset and F&lt;sub&gt;2&lt;/sub&gt; vowel frequencies were acoustically determined and plotted as locus equations. Fairly distinct clustering of slope and y-intercept coordinates were found for labial, dental/alveolar and velar places of articulation. Approximants (/w, j, r, l/) formed a unique cluster of points characterized by slope = 0 and contrasted solely by y-intercepts – correlates of steady-state onset frequencies of approximant productions. The consistent linearity observed in all locus equation plots across all consonant-vowel tokens is discussed according to the orderly-output constraint that hypothesizes that the robust linearity of the acoustic F&lt;sub&gt;2&lt;/sub&gt; transition onset-to-offset relationship exists to best serve neural encoding and perception of the speech signal.

The Phonological Reality of Locus Equations across Manner Class Distinctions: Preliminary Observations