It's annoying to have to google stuff myself to see what in the world you're even talking about, when you could have just said they were USB wireless with no other connections.
Anyway, I was hoping for an analog connection, like 3.5mm TRS (ancient standard headphone) or something like that, that could run through another box. In the absence of that, it looks like we need to figure out how to insert a software thing instead of a hardware thing, which is much harder because software is nowhere near as visible. (that's the trap of going for the fancy convenience stuff at first glance - it's hard to do anything different from what the manufacturer says, and if the manufacturer isn't thinking...)
The best I can think of is this:
VoiceMeeter Banana, the Advanced Virtual Audio Mixer by V.Burel
vb-audio.com
VoiceMeeter Potato, the Ultimate Virtual Audio Mixer for Windows
vb-audio.com
Two different sizes of the same thing; pick the one that fits you better, including what you might do in the future.
Both of them install some virtual sound cards that connect to a virtual mixer. Send your apps' audio to those virtual sound cards, and then use the virtual mixer to send that to OBS and to your headphones. Then the headphones can keep the settings that you like, and OBS gets its signal *before* that point.
Maybe. It's not just "bass" "mid" "treble". It's a low shelf with a specific frequency that you don't know and can't control, and a slope that you don't know and can't control. Likewise for the high shelf. The mid is a bell curve or peaking EQ band, that you also don't know and can't control the frequency or bandwidth of. I really don't like that type of EQ, no matter where it appears, but that might be because I'm used to this:
View attachment 98766
4 bands, all of which show and adjust all 3 parameters, and even choose the type for each one. Plus a separate "rumble filter" or "highpass" or "low cut", depending on what the sound board calls it that I'm running. Same thing regardless of name.
Only if all the other parameters match, can you undo it with opposite gain. If the low boost has a higher frequency than the low cut, for example, because you're using different tools for each that made slightly different decisions, then you'll end up with a slight bell boost, and not a complete undo:
View attachment 98767
As you can see, the lower two bands are both set for a low shelf, with opposite gain, but different frequency. They don't completely cancel.
The upper two bands are both set for a high shelf, with opposite gain, and everything else the same. They do completely cancel.
If you really care enough, you could play some pink noise through your enhancements and through OBS's EQ filter, and then measure what each one does with that noise. The better the measurement tool, the more accurate the result. I would not be surprised if they *were* slightly different, which means that they'll never exactly cancel.