| More generally, voiceless obstruents are more frequent in onset position than voiced obstruents. |
| Voiced obstruents can stand only before vowels, sonorants and voiced obstruents in the same word. |
| There are five place contrasts for oral and nasal obstruents, and four for approximants. |
| Clusters of obstruents always agree in voicing, and clusters of sibilants and of plosives with the same point of articulation are prohibited. |
| Sonorants contrast with obstruents, which do stop or cause turbulence in the airflow. |
| Whereas obstruents are frequently voiceless, sonorants are almost always voiced. |
