No, you won't get audio through the headphones if you only have the USB Wi-Fi dongle connected to the CS18AI and RM Series mixer and they're both connection to a wireless router. On that configuration, you'd be able to control the RM Series mixer from the CS18AI, but audio wouldn't be passing through the CS18AI. If you want audio to pass through the CS18AI, you'll need to have it hard wired to the RM series mixer either via a direct connection or an AVB switch.