Although labeled High Performance Sound, this is actually the basic Volvo audio system. Before you get disappointed, "basic" means 160-watts with eight speakers, USB and auxiliary inputs, and HD Radio, which is pretty pretty good. It also includes a Bluetooth hands-free calling system.
The true premium audio option is a Dynaudio sound system with Dolby Pro Logic II surround sound. Speaker count has been pushed to 10, but they are also of higher quality and are pushed by 650-watts of amplification. This system also includes Volvo's hard-drive-based navigation system with real-time traffic information.