this may help
the orasat 5.0 version does have the ac3 audio .
Full DVB
Improved New Tuner
Advanced Smart Card Access Card Reader
Xcrypt CAS embedded
Simple user friendly operating menu and on screen graphics menu
Satellite Search
Pre-Installed Channels (Optional)
4000 TV/Radio Channels
40 Satellites
Multi Languages 10(OSG and Menu): English, Spanish, Portuguese, French, German, Turkish, Arabic, Parsi
Full On Screen Channel Guide Display EPG (Electronic Program Guide)
OSD On Screen Display with 256 Full color interface
Extended EPG and program reservation through EPG channel guide
5 Favorite groups with names changeable
Fast Channel Change
Each Channel Volume Saving Memory Function
4 color buttons for RAPID selection and convenience
Age protection lock function
Tele-text encoding (OSD and VBI Insertion)
Manual PID control
DiSEqC 1.0 and 1.2 compatible
Closed-Caption Support
RCA Output
Component Video outputs (YUV)
S-Video for high resolution support
Digital AC-3 Audio S/PIDIF output
Universal Remote Control Infrared (IR) 4 component
Zoom Function
Stand By Mode
Automatic Channel Search
Still Pause Picture
Sleeper Timer
Last Channel Memory Function
Powerful Channel Control by Favorites, Loc, Skip, Move and Channel Sorting by Alphabet, Transponder hope this helps you its a real cheap and good fta unit