The monitor outputs are what is known as "line out" if you want to read more about it. As you discovered, it is similar to but different from a headphone signal.

I'm surprised you learned from here that mixing with headphones is preferred. It is not. Headphones should be used to test a mix but not as the only way to make one unless you absolutely cannot use good nearfield monitors.


BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors