Centralized configuration of audio and video: Configuration of hardware and media frameworks are offered in a single, centralized dialog.
Purpose driven design: Instead of demanding that you select special audio outputs for applications, Phonon applications describe what kind of sound output they make and lets you select for these categories individually.
Automated device selection: Pluggable audio and video devices like USB or Bluetooth headsets become easy to use with Phonon. Phonon acts on information and signals from Solid, which is KDE's hardware subsystem, and automatically makes use of new devices.