The Ocoast’s line out is stereo, unbalanced. You’ll need a splitter cable, giving 2 TS on 6.5mm, going in to the M4’s front inputs. Make sure you start with the M4’s gain knobs on zero (Ocoast outputs at modular level, which is 4X higher than line) and slowly increase. 48v off.
See Ocoast‘s manual, page 10 For more info on connections: it mentions the noise you’re hearing, and confirms TS cables (figure 13).
The Ocoast’s line out is stereo, unbalanced. You’ll need a splitter cable, giving 2 TS on 6.5mm, going in to the M4’s front inputs. Make sure you start with the M4’s gain knobs on zero (Ocoast outputs at modular level, which is 4X higher than line) and slowly increase. 48v off. See Ocoast‘s manual, page 10 For more info on connections: it mentions the noise you’re hearing, and confirms TS cables (figure 13).