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Does that second headphone jack serve as headphone OR mic, or does it actually serve as a headset jack?
The second headphone jack is only a headphone jack (no mic input). The primary headphone jack serves as a 4-pole headset jack (voice + audio).
That is bizzare, especially given that it's got four-pole IN.
Perhaps to accommodate sources which merge line out and mic into one output and to allow it to be used for either audio out and mic in. Though the E3 only uses one or the other and not both, sadly
I asked their support department for clarification. This is what they had to say:
"The E3 has two 3,5mm jacks to connect your headphone: one headphone out and one headphone out/mic in. Both jacks can handle 4-pole connectors but only the combined headphone/mic jack can handle audio and mic simultaneously. So in case you have a 4-pole TRRS connector (headphone with mic), you can just plug the device to the headphone/mic jack and you can have audio output and mic input. The other headphone jack only can handle audio, so the mic will not work."