Early Austroasiatic speakers are estimated to have originated from an lineage, which split from Ancestral East Asians between 25,000 and 15,000 years ago, and were among the first wave to replace distinct Australasian-related groups in Insular Southeast Asia.
ˈɜːli ˌɔːstɹoʊsɪˈæɾɪk spˈiːkɚz ɑːɹ ˈɛstᵻmˌeɪɾᵻd tə hæv ɚɹˈɪdʒᵻnˌeɪɾᵻd fɹʌm æn lˈɪnɪɪdʒ, wˌɪtʃ splˈɪt fɹʌm ænsˈɛstɹəl ˈiːst ˈeɪʒənz bᵻtwˌiːn twˈɛnti fˈaɪv,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ ænd fˈɪftiːn,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ jˈɪɹz ɐɡˈoʊ, ænd wɜːɹ ɐmˌʌŋ ðə fˈɜːst wˈeɪv tə ɹᵻplˈeɪs dɪstˈɪŋkt ˌɔːstɹɐlˈeɪʒənɹᵻlˈeɪɾᵻd ɡɹˈuːps ɪn ˈɪnsəlɚ sˈaʊθiːst ˈeɪʒə.