Phon/phone

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Across
  1. 4. Short form for a device used to make calls (5 letters)
  2. 5. Musical instrument invented by Adolphe Sax (9 letters)
  3. 6. Tool used to make announcements louder in large crowds (9 letters)
  4. 7. A harsh, unpleasant mix of sounds (9 letters)
Down
  1. 1. Device that transmits sound over long distances (9 letters)
  2. 2. Device used by singers to amplify their voice (11 letters)
  3. 3. A harmonious group of instruments playing together (8 letters)
  4. 8. Words that sound the same but differ in meaning and spelling (9 letters)