Another tech I work with suggested the idea of connecting an ipad to the WAP on the CQ18T, to control both the CQ and also a QSC LA108 array via Sysnav IP control over ethernet directly from the CQ18 Lan port to the QSC array with no additional switches or router.
Looking at the manual only 1 network interface can be activated at a time.
As far as we have been led to believe, the wireless/WiFi connection and the Ethernet are mutually exclusive. However you could run a small router to achieve what you want.