This is one of the most common Suno frustrations, and it's usually a prompt conflict — something else in your description is outweighing 'male vocalist.'
1. Put the voice FIRST in the Style box. Order matters: deep male vocalist, warm baritone, acoustic ballad works better than acoustic ballad with a deep male vocalist. Lead with the singer.
2. Hunt for conflicting descriptors. Words like ethereal, airy, delicate, soaring, angelic skew female; gravelly, deep, rumbling, baritone skew male. If your prompt says 'male vocalist' but also 'ethereal and delicate,' the adjectives win. Match your adjectives to the voice you want.
3. Name the register: tenor, baritone, alto, soprano — register words are stronger than gender words. Baritone male vocal is nearly bulletproof.
4. Reference singers, not genders. Vocal style like Johnny Cash (don't expect an imitation — it guides the register and delivery) beats 'male singer' alone.
5. Lock it once you get it. When a generation nails the voice, save the exact Style wording. Reuse it verbatim next time — voice consistency comes from prompt consistency.
Good luck! Hank founder of SonorixPG