Yes, all Dante AVIO adapters require a power source. Most Dante AVIO adapters require the use of a network switch with PoE (power-over-Ethernet) capabilities or the use of an 802.3af compliant PoE injector device. The Dante AVIO USB adapter also has a third option – it can also receive power through the USB device to which it connects if that device has adequate power output. If using a switch with PoE, make sure it is configured to send power. An AVIO will use up to 1.5w of Power.