All eyes and ears

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Across
  1. 3. a loud horn
  2. 5. sign up
  3. 9. a group
  4. 10. a hall
Down
  1. 1. a mental picture
  2. 2. a record player
  3. 4. a music instrument
  4. 6. a mountain range
  5. 7. an original book
  6. 8. headphones