4 Channel Line Level Output Dante/AES67 Interface, PoE. The Attero Tech by QSC unD4O is a Dante™/AES67 interface with four balanced, line-level outputs that offer a cost-effective way to integrate Dante audio outputs into an existing Dante or AES67-based networked AV system like the Q-SYS Ecosystem. The unD4O offers PoE capability and a small form factor that make it simple to put network audio connectivity where it is needed - near the audio sink - thereby eliminating the need for costly and interference-prone analog wiring