What is critical to achieving a good quality "ah"?

Achieving a good quality "ah" sound primarily relies on the clarity of the sound produced. Clarity is essential because it ensures that the sound resonates well and is heard distinctly, allowing it to convey meaning effectively in communication. A clear sound is achieved through proper vocal techniques, including the positioning of the tongue, lips, and vocal cords, which contribute to an even and focused tone.

While other factors like breath support, length of time sustaining the sound, and volume can influence the overall quality of vocalization, clarity stands out as the primary aspect that determines how well the sound is articulated and understood. Breathing techniques can enhance support for producing sound, and sustaining the sound may help in showcasing vocal control, yet none of these elements replace the importance of how clearly the sound can be communicated.