Deep Voices
Worth saying plainly: nothing in the catalog records pitch, so these six were chosen by ear rather than filtered. There is no pitch control either, so depth is a casting decision.

VOICES FOR THIS USE CASE
What the catalog cannot tell you
Being straight about this: there is no pitch or timbre field in the catalog, so nothing filters for depth. The voices listed here were chosen by ear from mature male voices and should be auditioned rather than trusted. Any page claiming a filtered list of deep voices is describing something the data does not support.
Where depth tends to sit
In practice the mature age group is the more productive place to look, with 86 voices carrying that tag. That is a correlation rather than a rule, and several young voices read as deeper than mature ones. The only reliable method is listening.
No pitch parameter either
A voice cannot be lowered after generation. There is no pitch control, so depth comes entirely from the voice you cast. Speed, from 0.5 to 2.0, is the only delivery adjustment, and while slowing a read makes it feel weightier, it does not change the pitch.
Coverage across languages
These voices span English, Hindi, Tamil, Odia and Bengali, so the shortlist is not English only. Across the catalog 144 voices carry an Indic recommendation, which means depth can be cast for in regional languages as well, again by ear rather than by filter.
SPECIFICATION
Sample rate
44.1 kHz native, resampled to 8 kHz for telephony
Latency
~200 ms to first byte (p50, warm region)
Output formats
ulaw, alaw, PCM 16-bit, WAV, MP3
Streaming transports
WebSocket, HTTP chunked transfer
Speed range
0.5× – 2.0×, set per request
Explore Voice Similar to
Deep Voices
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