pan in mixer section

Hi,I was playing in a different place from home were I usually play,and I feel like the operator not have so much volume like always and then I notice that when the channel pan was in the middle it was very low but if I move to R or L the sounds became louder.The chain was just op-1 into mixer and the into an active studio monitors(m-audio),using my usually stereo minijack.any suggestions?

thanks
Mattia

95% sure you’re plugging the unbalanced stereo output of the OP-1 into a balanced mono input on the monitors.

The way balanced inputs are wired, the monitors are playing the left minus the right signal. So if you’re center panned, almost nothing.

You need a stereo->dual mono sort of cable, e.g. https://www.amazon.com/Hosa-CMP-153-Stereo-Breakout-Cable/dp/B000068O3C