Pairing Behringer X32 with Bose Panaray System Issues

I'm fairly new to all of this. Our church just purchased a Behringer x32 board to replace a failing Mackie analog board. I've watched tutorial on setting optimal gain on channels and then adjusting my main speakers to align with Unity on the board's main fader. The level sounds good..generally. However, I'm getting distortion on panaray speakers at -12db (according to the x32 main fader/meter).
The Bose Panaray's are connected to a Panaray Digital Controller II. I've turned down the output level to no avail. I assume the issue is with the signal coming into the Panaray controller being too hot. I cannot find an installation manual on that controller to understand exactly what I need to do. I've adjusted the input sensitivity..which has helped, but still getting distortion far before getting into the red on my meter.
Appreciate any guidance.
The Bose Panaray's are connected to a Panaray Digital Controller II. I've turned down the output level to no avail. I assume the issue is with the signal coming into the Panaray controller being too hot. I cannot find an installation manual on that controller to understand exactly what I need to do. I've adjusted the input sensitivity..which has helped, but still getting distortion far before getting into the red on my meter.
Appreciate any guidance.