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I think I can provide a tl;dr question here: If I have Ear L 1, Ear R 1, Ear L 2, and Ear R 2 connectors, can I presume the 1's are the main Line outs, while the 2's are the return / bline / whatever-else-people-may-call it? If so, on what pins?

Secondary question: I have a missing connector among the Mic ones; is it GND? I don't mind not connecting Mic if it' risky.

Full details

Upgrading hardware and using the old to make a "new" old computer. I have a case I got from a friend whose front panel audio connectors are divided into two cables:

  • Cable 1: Mic-VCC (red), Mic GND (black), unknown (white; connector missing) -[what's missing? Should I leave mic disconncted?]
  • Cable 2: Ear L 1 (black), Ear R 1 (brown), GND (black), Ear L 2 (red), Ear R 2 (orange).

My motherboard is a Gigabyte GA-MA785GM-US2H, whose header supports both AC '97 and HD audio. Details should be here, though website is down right now, but I guess it was always best to reproduce here what the manual says anyway:

HD Audio

  1. MIC2_L
  2. GND
  3. MIC2_R
  4. -ACZ_DET
  5. Line2_R
  6. GND
  7. Faudio_JD
  8. no pin
  9. Line2_L
  10. GND

AC '97

  1. Mic
  2. GND
  3. Mic Pwr
  4. NC
  5. Line out R
  6. NC
  7. NC
  8. No pin
  9. Line out L
  10. NC

Now, from my research and a helpful response on this topic, I think I kind of get what's going on, as there are apparently many ways that these audio cables can be labeled, so I should be able to follow instructions like those in that topic and just substitute my weird 2's connectors with the varying ones I read about online. However, I don't know exactly what pins. If they're going in to the 5 & 6 and 9 & 10 pins, which takes Ear 1 and which takes Ear 2?

Does being this concerned even matter? As long as VCC and GNDs are matched or left alone correctly, and maybe output vs input is correct, is there any risk of ruining anything if mismatched?

Thanks.

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Rhoi
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