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See Tip Ring Sleeve at Wikipedia
Excerpt:
2. Ring: Right-hand channel for stereo signals, negative phase for balanced mono signals, power supply for power-requiring mono signal sources
3. Tip: Left-hand channel for stereo signals, positive phase for balanced mono signals, signal line for unbalanced mono signals
4. Insulating rings
| Unbalanced | Balanced | Stereo | |
|---|---|---|---|
| Tip | Signal | Positive/"Hot" | Left channel |
| Ring | Not present | Negative/"Cold" | Right channel |
| Sleeve | Ground/Return | Ground | Ground |
References
- Cable Buying Guide - sweetwater.com
- a nice summary of common cables and a discussion of balanced and unbalanced cables.