As a Keneticist specializing in Laryngeal Anantomy and Advanced Vocalization Care in Japan, I’ve touched the larynxes of thousands of people and heard their voices.
I can identitfy and classify what kind of voice they have only with touching the larynx.
I investigate (A)The size of the thyroid cartilage i:width ii:back and front iii:length (B)Analyzation of the difinitve angles of the thyroid cartilage (C)The movable angles of the cricothyroid articulation (D)The static position of the hyoid bone and mandible.
I’ll explain the shape of the thyroid cartilage relevant to the condition standards of a good voice.
A:The size of the thyroid cartilage i:width
A:The size of the thyroid cartilage i:back and front
A:The size of the thyroid cartilage ii:length
B:Analyze the difinitive angles of the thyroid cartilage
C:The movable angles of the cricothyroid articulation
D)The static position of the hyoid bone and mandible
Bigger thyroid cartilage, in turn, produces better vocals sounds. This is because the space of the resonance chamber becomes bigger in the thyroid cartilage, primarily when the vibrating area of the vocal cord increases.
This is same with musical instruments. The instrument’s sound range, depth and volume depend on the size of the instrument itself.
However, a point that must be realized is that you need throat and neck muscle strength to support having big thyroid cartilage.
I would recommend you to investigate your throat. Make sure that you can use 100% of your muscles properly without pain or strain.
It is a shame if someone has good shaped thyroid cartilage but is not fully utilizing it through great singing!