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This paper aimed 1) to compare the length of Korean geminate vs single consonant sounds produced by Korean, Japanese and Australian speakers and 2) to analyze Korean liquid geminate vs single sound pronunciations produced by Japanese learners who do not have geminate liquids in their L1. The Japanese Beginner Group, whose L1 has a length distinction between geminate and single consonants as in Korean, produced length ratios closer to those of Koreans than the Australian Intermediate Group did. This showed that L1 influence was stronger than the experience of L2 learning. Even though Japanese learners (both the Beginner Group and the Experienced Group) could well distinguish Korean geminate and single obstruents and nasals in their production, their phonetic realization of liquid geminate and single sounds was neither clear nor similar to that of Koreans. Clear phonetic, not phonological, differences in quality between similar sounds in L1 and L2 seems to be an obstacle for L2 learners which cannot be overcome in a short time. The geminate structure of the sounds seems to give L2 learners more difficulties when they produce them.