Only in Pwo Karen 28
What this means for learners
Pwo Karen and Javanese share 24 sounds — roughly 46% of Javanese's inventory overlaps with Pwo Karen. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 9 sounds found only in Javanese represent the greatest pronunciation challenge for Pwo Karen speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, Pwo Karen has 28 sounds not used in Javanese. Native Javanese speakers learning Pwo Karen will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.