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One of the main challenges individuals face when learning an additional language (L2) is learning its sound system, which includes learning to perceive L2 sounds accurately. High variability phonetic training (HVPT) is one method that has proven highly effective at helping individuals develop robust L2 perceptual categories, and recent meta-analytic work suggests that multi-talker training conditions provide a small but statistically reliable benefit compared to single-talker training. However, no study has compared lower and higher variability multi-talker conditions to determine how the number of talkers affects training outcomes, even though such information can shed additional light on how talker variability affects phonetic training. In this study, we randomly assigned 458 L2 Spanish learners to a two-talker or six-talker HVPT group or to a control group that did not receive HVPT. Training focused on L2 Spanish stops. We tested performance on trained talkers and words as well as several forms of generalization. The experimental groups improved more and demonstrated greater generalization than the control group, but neither experimental group outpaced the other. The number of sessions experimental participants completed moderated learning gains.