What Size is the Xbox 360 Headset Jack?
The Xbox 360 headset jack is 2.5mm. It’s a bit smaller than the standard 3.5mm jacks you might be used to.
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It’s 2.5mm, which means you'll need a specific adapter if you're trying to use regular headphones.
2.5mm - because why would it be the standard size when it can be smaller and more annoying?
Definitely 2.5mm. Take it from someone who tried jamming a 3.5mm plug in there... did not go well!
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