I purchased a presonus 1818 from a friend. I hooked up everything to my Mac (currently running sierra). I have not yet installed any DAW, I'm just setting up my studio. I purchased high end Mackie hr824 Mk2 studio monitors which I love.
However after connecting the monitors to my 1818 (no vsl software) everything sounds noisy. It has the sound of a TV (when signal is lost). Its doing it constantly.
I currently have my monitors connected to the L/R main outs, I also tried 7 and 8 with no solution.
Ps - I also tried another pair of Maudio bx8 monitors and its still the same.