http://www.p4c.philips.com/files/m/mx3600d3799/mx3600d3799_dfu_aen.pdf repeats this by show no inputs to the surround system.
As it stands the MX3600 is not something usable where there are other devices like the TV or Roku.
Where did you read the MS3600 had audio inputs?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic