How important are RCA cables?

Related questions

1. How long can RCA audio cables be?
2. What does XLR balanced mean?
3. What is analogue audio output?
4. Is analog audio better than digital?
5. Is analog recording better than digital?
6. Are XLR cables always balanced?
7. Is XLR balanced or unbalanced?
8. What RCA unbalanced?
9. Do RCA cables make a difference?
10. What is better balanced or unbalanced audio?

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22. #pictured