Use the adjective intelligible to describe speech that is loud and clear, like the intelligible words of your principal which, thanks to a microphone, you were able to hear.

When your goal is to make your writing intelligible to anyone who reads it, you choose clear, precise words and give details that tell more about what you mean. You might also include examples. Intelligible comes from the Latin word intelligibilis, "that can understand or that which can be understood." The earlier meaning of intelligible was "able to understand," which today is closer to the meaning of intelligent.

Definitions of intelligible
  1. adjective
    capable of being apprehended or understood
    synonyms: apprehensible, graspable, perceivable, understandable
    comprehendible, comprehensible
    capable of being comprehended or understood
  2. adjective
    well articulated or enunciated, and loud enough to be heard distinctly
    intelligible pronunciation”
    comprehendible, comprehensible
    capable of being comprehended or understood
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    poorly articulated or enunciated, or drowned by noise
    incomprehensible, uncomprehensible
    difficult to understand
    slurred, thick
    spoken as if with a thick tongue
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