Hello shadowpersonified,
I'm having the same "issue", though this is actually not an issue.
You see, Bandicam (just as any other software, capable of recording audio) just records whatever is sent on the buffer that belongs to your selected audio device (in this case Stereo Mix), which is also what you hear.
Therefor it is no wonder Bandicam records your bass-boost, because that's kind of Bandicam's job...
You can also try different audio recording software and you will find yourself with the same result (try
Audacity for example).
There's an easy fix though, disable your audio enhancements whilst recording. Don't worry your ears will survive it, I've tried.
I hope I was able to help,
best regards,
--Zuzu_Typ--
Ok well in the end, I followed your advice... I was using a program (that came with my sound driver) called Waves MaxxAudio or something like that. It was able to alter the sounds, and I used it to change the bass/treble and I had come to rely heavily on those adjustments for music and gameplay and just all audio I listened to.
Going with your advice, I disabled it, and went back to the flat default audio... Then I went to my "Speaker" Playback settings and went into the Enhancements there and adjusted the Equalizer. In there, I made a custom setting and adjusted the bars until I got a sound that was as close as possible to what I had created in the MaxxAudio software. It will take a small amount of adjustment but I can get behind how it sounds with just the equalizer settings and no Maxx. The good news is!! When I record sounds, the bass/overall adjustments that I acquired from the Equalizer isn't doubled when recording.
Now I can listen to the audio the way I want it, but it also isn't doubled up in recording for some reason. I don't know what the program was doing, but luckily, the default Equalizer in the audio settings knows not to double itself in recordings. Thanks for the help regardless, as my answer did resolve around turning off those enhancements from MaxxAudio. I just didn't know Windows had it's own equalizer that I could adjust things in. So glad that this is finally cleared up, it stopped me from recording videos a year ago because I didn't know how to resolve it (and I've had Maxx since the beginning too, which is why turning it off seemed like the end of the world for me).