Can you somehow hook up your 3.5mm Jack into your X360 while using HDMI

The answer is no. HDMI stands for High-Definition Multimedia Interface. The audio and video are transmitted in digital format (1s and 0s). In order to connect headphones (or anything else), you would need a DAC on one end.

But good news: your TV sports a DAC for sound purposes, and chances are high that you can connect your 3.5mm minijack into the TV's output.


Unless you mean the fact that the Xbox360's output ports are configured in such a way that makes it nigh-impossible to connect anything else whilst HDMI is plugged in! In that case, you can crack the HDMI plug's case open using a flat-head screwdriver. Keep in mind that this will expose the cable and connector to excessive wear&tear and the elements, and it may break much sooner. (spilling any liquid on a so exposed connector may also mean a death sentence to your console, too)