What does danger sound like? It is the voice of the cool character who doesn't have a care in the world. A retired detective living on the edge perhaps? A dangerous voice instantly tells you that the speaker has o reservations, and it makes you want to know more about their story.
A dangerous voice is dark and brooding. It carries a ton of mystery and in as much as it is uncaring, this voice is also full of caution. This voice can come off as aggressive to some, but a dangerous character simply chooses to be brave rather than to fit in.
You ever listen to a trailer of a thriller movie being advertised? The voice is dark and heavy, leading you on into the mystery. A dangerous voice has no hint of ingenuity or fear. Video games can design their most assertive characters to have this type of voice.
A dangerous voice can be deep and intriguing. Sometimes it can lack any feelings or emotions, as in apathetic, and it can also be interpreted as condescending. A dangerous voice can be scary, or it can be cautious. This voice can also sound angry, and it is more common among male voice actors than females.
The danger in a voice is not about how loud it is. In fact, dangerous voices tend to be low pitched and calm. A dangerous voice can sound assertive, but it does not bully the listener into submission.