I recently installed a set of Kenwood KFC-XR61P and installed the crossover above the door speaker under the door panel. I'm not sure about the size difference between the Infinity and the Kenwood crossovers, but mine fit fine. Just measured, remeasured, and remeasured again. If I need to make any adjustments to the crossover, I'm able to pop the electric window control panel from the door, and access the crossover.