Instruments Alphabet Soup

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Across
  1. 1. One of many types of filters
  2. 2. Only the rich can afford this on a cruise!
  3. 3. Vehicle full of bits?
  4. 6. Jacuzzi
  5. 10. Boa constrictors and vipers use this for their prey
  6. 11. Moon is one of them
  7. 12. Young adult novel by William H. Armstrong
  8. 13. How to get the best deal in Istanbul?
  9. 14. Raytheon's 1945 patent was based on this
  10. 16. Pig
  11. 17. Weed product?
  12. 18. One of two responses when you face a bear in Denali
Down
  1. 1. Key to make robots more human
  2. 4. Imagine life without this today!
  3. 5. Olfactory sensation near a DC motor?
  4. 7. Prerequisite to an engagement?
  5. 8. Mental disability usually with a prefix
  6. 9. Don't do this when the train is approaching!
  7. 14. National Geographic's forte
  8. 15. H.G. Wells' theme (more or less) in his 1897 novel.