Okay guys I figured it out and wanted to share on the off chance someone ever has this problem as well. I wanted to be able to use my apple AirPods while recording an interview with someone, and also capture the system audio as well. I kept having issues where either I sounded like a robot to the person I was speaking to, or afterwards in the recording my guest sounded like a robot. (ps I'm on an iMac running on Mojave).
First I downloaded iShowU audio capture:
http://bit.ly/2S6CscS
Then I followed these steps to setup a multi output device under the audio midi settings:
http://bit.ly/2R20l4c
*Now he only caveat is when you're looking at the "multi-output device" there's going to be three things listed, "ishowu", "your AirPods", and "built in output" Make sure only "ishowu "and "your AirPods" are selected on the left side under the "use" column. If built is audio is selected as well, its going to export your voice twice over, which is what causes that robot sound. Here are my settings:
Make use your sample rate for the multi output is ask 44.1 as well as that is what OBS's default setting is.
Now if you're using the AirPods after all of this and the volume is super low, you can't use the normal volume up buttons on your computer because you've made a custom device. You have to do back into the midi device setting and adjust it. Click "your AirPods" the one that says it has "2 outs". You'll have to increase the volume bar on 1 and 2, as it controls either ear bud independently.
I really hope this helps someone. It took me weeks of passively tinkering to figure it out.