Hello

The United 777 BC configuration has two jacks, but they are two different sizes. The plug on my behind-the-ear Sennheiser earphones, which I believe is 1/8 inch diameter, won't fit into either port. Which one is the output power for their noise canceling headset, the larger or the smaller port? What are the actual sizes of those jacks? Yes, I searched this forum and turned up some useful information but nothing that specifies the jack sizes. Of course I want to use my own headset. If I'm supposed to use one of these two ports, which one is it and what adapter do I need?

Thanks

RedRock2
Ashburn VA