Looks like the A200 does not have Dolby Mobile.
Acer Iconia Tab A200: Other features, battery life
The Acer Iconia Tab A200 only has a small 8GB of internal memory, but the microSD card slot means you can expand that significantly. The full USB port worked reasonably well during testing, but it was often erratic: it worked fine with our 1TB portable hard drive, but did not connect to a 4GB Sony USB stick, for example. The Iconia Tab A200's built-in speaker is poor — we found its volume to be awfully low, so much so that it is virtually impossible to hear unless you're in a dead quiet room.
This is from a review by PC world.