There is a simple exercise you can do right now to demonstrate why a voice in some men is not deep consistently. Stress elements play a large role in voice crispness providing you do not need medical assistance. This simple exercise shows how the voice box is structured.

You can do this right now if you are alone, simply hum a flat tone with your head tilted down with your chin nearly touching your chest, now continue the tone but lift your head right back with your face to the ceiling.

What you will find is when you lift your head high, the pitch changes automatically to a higher pitch. It would be impractical to talk with your jaw tucked into your chest all the time, but this simple exercise demonstrates how the larynx is built and how it works.

The larynx is essentially a muscle group that is formed in such a way to facilitate raw sound when air passes through it. This raw sound is shaped into words by the use of mouth shape and tongue manipulations. It is this raw sound we are interested in changing if we want a deeper and crisper voice.

From the exercise you will notice that despite your best efforts to maintain the same tone, it undeniably changed when you lifted your head, it went to a higher pitch. What actually happened is that your voice box muscles were stretched. When your jaw was at your chin, the voice box was limber, much like winding down a guitar string lower, the pitch changes.

Stress elements in the larynx create that lost control and the tightness in the larynx is what is responsible for your inability to maintain and control a crisp, deep speaking voice.