The fortis-lenis contrast is traditionally defined by “articulatory force” and correlates with a host of measures, including closure duration, f0, amplitude, VOT, open quotient, and spectral tilt (Kohler & Dommelen, 1987; Cho et al., 2002). These measures are also features of voice quality (Keating et al., 2011; Brunelle et al., 2020) and gemination contrasts (Idemaru & Guion, 2008; Kraehenmann, 2011), and gemination has been suggested to be a type of fortis-lenis distinction (Ladd & Schmid, 2018). The current study explores acoustic correlates of initial /T K/ vs. /t k/, a contrast variably termed as initial gemination or fortis/lenis, in Dunan, a highly endangered Southern Ryukyuan language (Bentley, 2008; Yamada et al., 2015). Audio from fieldwork sessions with an elderly speaker were aligned with the Montreal Forced Aligner (McAuliffe et al., 2017) and measures of /T K t k/ and the following vowel were taken. The contrast is cued not only by closure duration and VOT, but also by f0, amplitude, H1*-H2*, H1*-A3*, and CPP differences that persist over the following vowel. This naturalistic data contributes to evidence for a constellation of acoustic features shared between fortis-lenis, gemination, and voice quality contrasts that may point to commonalities in laryngeal configuration.