Question: does pxc 550 support aac?
Answer: AptX is the only codec that the original PXC 550 supports. The 550-II supports AptX, AptX Low-Latency for lag-free movie watching, and AAC for higher quality with Apple devices. ... on the original PXC 550. You can still select all the same listening modes on the IIs, but from the Sennheiser Smart Control App.