The Nasal Cavity
When the voice reaches the break point or passagio, the resonance and placement changes, just like any wind instrument. As you can see from the image below, the uvula and soft palette don't offer much of an enclosed space to resound in. This is why we have to engage our abs, anchor and direct the air-flow into the nasal cavity.
However, when we do this, it can sound awful unless we take it to the back of the space and fill the centre of our heads with sound.
As the pitch gets higher, the top of the head resonates and the fluid in the brain 'jiggles' too.
Why not try moving the resonance around from the front to the back of the nose and then down into the chest. Experiment, feel free to make a noise. You are finding out what works and doesn't work for you and your unique sound. There is no one like you in the whole universe.
If you get stuck, you can book a lesson with me.
Send me an email: schoolofsingers@gmail.com