Sonos 4 is a Nine & Sixteen band audio processor for broadcasters.

There are many additional features added into the Sonos. You now get stereo multiplex and RDS encoders for FM broadcasters (needs a 192kHz sound card).

Another added featuer is a two way audio over IP function for studio to transmitter linking or outside broadcasts.

Finally, it now supports streaming in MP3 or AACPlus formats to Icecast or Shoutcast servers.