Klein's Voice Placement

42. Clearing the Path for the Tone. 

The primary step, in training the voice to obtain access to the resonating cavities, is to provide the requisite space in the direction of the nasal cavities, or, in other words, clearing the only path whereby the tone can reach them. This will be accomplished, to begin with, by flattening the tongue and raising or arching the soft palate in the manner described under the heading "Adjustment and Attack," par. 14.

43. Placing Tone in the "Masque." 

The second step is to begin the note with the thought (if not the actual sensation) that the tone-vibrations are being simultaneously projected or reflected—not pushed by sheer lung-power—into these "forward cavities" situated in the "masque." This thought and its application, after some practice, should quickly enable you to realize with certainty what resonant or ringing tone actually is.

—Shigo, Daniel James. Hidden in Plain Sight: The Hermann Klein Phono-Vocal Method Based upon the Famous School of Manuel García (VoiceTalkPublications, 2013): 18

It’s a simple teaching method better understood by students whose heads aren't filled with scientific facts.

"But the vocal tract is the only resonator!" intones the 26-year-old doctoral student. Klein doesn't know what he's talking about—and really, García never taught singing in the mask! What nonsense!"

I'm sorry, young man. You haven't a clue. You are mixing your centuries, for starters—never a smart thing to do. It's better to understand why those who have gone before you think as they do. Their understanding of the cause of voice placement—even if inaccurate from a scientific viewpoint—doesn't take away its effect.

Yes, there are no resonators in the head—we all know that. However, what you don't understand is that old Italian school voice teachers taught their students not facts but what to do and where to listen to the result.