Using two 1/4 inch speaker cables I would like to use both amp A and B into upper 410 A and lower 410 B. From which 1/4 inch jack do they come from? I’m pretty sure I can tell which too put them into. Which position should the stereo/mono button be in? If someone has this rig and can just take a picture of it in this configuration, that would be appreciated. I tried to make sense of the manual but I’m not great with that. They tried using one picture to show two different ways at once. The videos didn’t help either. Thank you