How do I record audio input on my Mac via 3.5mm jack?

[TheOriginalKilljoy]

I am currently setting up a recording setup for my church, we are using rca output on an allen & heath gld80 mixing board. We are using an rca to 3.5mm jack adaptor for output. The board is configured correctly to my knowledge, but I can’t figure out how to capture audio from the headphone jack in obs. The macbook being used is a macbook air with an m1 chip. Thanks in advance for the help.

 

[mishakim]

The 3.5mm jack is a combined mic/headphone jack, so you need a TRRS connector, putting the audio input between the second ring and the sleeve, the tip and first ring being the stereo output from the Mac. Assuming your RCA output is stereo, you'll also need to down mix that to mono.
I'd strongly recommend using a digital input device that will take your RCA connectors and connect to the Mac over USB, providing a digital stereo signal. My quick googling says the GLD80 has that natively so you shouldn't even need a converter.

 

[tripletopper]

Also if you want stereo input you have to buy two separate USB capture cards and route each channel of the stereo into one of the two separate cards one for the left one for the right. Then you have to monofy all the inputs by making sure that there's each device is considered a mono input and then mix it within OBS so that the left track is 100% stage left and the right track is 100% stage right and as long as you don't mix the two until you mix them an OBS you should be able to get a stereo input from those two. That's how I did it on my Macintosh and I documented how I did it in earlier thing. If you need stereo inputs you can buy two input capture cards which act as microphones and they have both RCA and TRS connectors and male and female doesn't matter you can play around with them change them, it'll all be the same.