Proto-Ekoid is reconstructed with the following vowels and tones: */i ʏ e ɛ æ a ɒ ɔ o u/; high, low, rising, falling, and downstep. The rising and falling tones, though, might be composite.
It is thought to have the following consonants:
| Labial | Alveolar | Palatal / Postalveolar |
Velar | Labiovelar | ||
|---|---|---|---|---|---|---|
| Nasal | m | n | ɲ | ŋ | ŋm | |
| Stop / Affricate |
p b | t d | tʃ dʒ | k ɡ | kp ɡb | |
| Fricative | central | f v | s z | ʃ ʒ | x ɣ | |
| lateral | ɬ ɮ | ʟ̝̊ ʟ̝ | ||||
| Rhotic | ʙ | r | ||||
| Approximant | β | l | j | ɰ | w | |
[ɲ] occurs at the beginning of a word, and [ŋ] in the middle or at the end.