So our company just purchased a few KF850z's for use as sidefills and we were planning on powering them with PLM10000Q's. After getting the greybox presets all loaded up and the boxes rocking the way I had hoped they would, I ran into a small hickup in that I couldn't figure a way to enable the fourth amplifier channel on the PLM. The default frame preset seems to disable some of the routing options on the PLM and we were planning on using the fourth channel to power a SB1000 for use under the 850's. Does the use of greybox presets preclude the use of additional output processing on that frame, even for the unused amp channel? Hopefully I am just missing something stupid.