this post was submitted on 29 Jul 2023
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I am making assumptions about the layout of your TRRS plugs, so it may still not work... be warned.
Your best bet here is to buy a dual TRS female to single TRRS male, specifically one with labeled headphone and mic inputs. The TRRS male from your headphones will have the second ring, the headset mic (TRRS), shorted to ground (S) when plugged into the headphone side of the adapter.
For the lav mic, the TRRS male layout is harder to predict, so using the included TRRS female to TRS male barrel adapter and plugging it into the mic-side of the dual-female-single-male adapter.
The expected behavior would be your headset and lav mic behaving like mic-less headphones and a TRS mic, consolidated into one TRRS male plug as a "headset." This is jank, but is a setup I have used myself. Ideally, you'd be able to buy a TRRS to TRS adapter for the lav mic separately, as those barrel adapters really suck and break too easily.
Is there any reason that the dual TRRS to single TRRS wouldnt work? Its the third link. It says that it's used for splitting one jack to be used by two headphones. Would the mic not function in this case?
I didn't suggest it because I have no clue how the adapter you linked would handle and combine two mic signals, and if it does, it would be combining the lav mic signal with your broken headset mic signal which could become frustrating (say, if your broken headset mic desides to start making static noise).
Hmm I see. Currently the headset mic doesn't input anything. I think I'll just buy both adapters and check it out.