Realization of the English postvocalic [voice] contrast in F1 and F2. Elliott Moreton Before a [-voice] coda, F1 is higher for monophthongs but lower for /aI/ than before [+voice]. We test the hypothesis that this is due to hyperarticulation before voiceless consonants (Thomas, 2000). Experiment 1, with 16 American English speakers, found the /aI/ pattern of more peripheral F1 and F2 in the offglides /oI eI aU/ as well, showing that it is part of the realization of [-voice]. The diphthong nuclei were less affected than the offglides. Experiment 2, with a different 16 American English speakers, collected "tight"-"tide" judgments of a synthetic stimulus in which offglide F1, offglide F2, and nuclear duration were varied independently. "Tight" responses were facilitated by lower F1, by higher F2, and by shorter nuclei. Log-linear analysis showed that the three factors contributed independently, and that F2 was a stronger cue than F1 in terms of logits per Bark. Experiment 3, with a different 16 speakers, replicated Experiment 2 for "ate"-"aid" judgments (/eI/ having shown the smallest effects in Experiment 1). Thus, [-voice] is correlated with, and cued by, peripheralization of diphthong offglides. [Journal of Phonetics 32:1-33 (2004).]