Both Echo and Onyx command attention, but through different qualities. Echo's depth creates immersion and authority. Onyx's boldness creates impact and urgency. Choose Echo for content that should feel substantial and Onyx for content that should feel important.
All samples use the high-quality tts-1-hd model at 1x speed.
| Characteristic | Echo | Onyx |
|---|---|---|
| Style | Deep | Bold |
| Description | Low and authoritative. Natural fit for narration and documentary content. | Strong presence. Good for announcements and high-impact messaging. |
| Best Use Cases |
|
|
Both have presence. Echo is deeper while Onyx is bolder.
The best way to make your decision is to test both voices with your actual content. Listen to the audio samples above with headphones, and consider generating test clips with your own scripts. Small differences in delivery can have significant impacts on user experience, so investing time in testing upfront will pay dividends.