Via your Android TV box go to Settings> Sound> Sound Device Manager> and check mark (Circle) "RK29_RK1000 PassThrough" ... You will have to this each time your reboot your Android TV Box, if you are using a 4.2 ROM build ... You don't have to do this, if you are using a 4.4 ROM build, once you set the Settings they will stay in tact even after a reboot ...
Via Beyond XBMC v3.4 or the Minix XBMC go to System> System> Audio output> System-Settings> set Audio output to "Optical/Coax and set Speaker Configeration to 5.1 or 7.1 depending on your AV receiver speaker set up (Digital Audio) ...
Concerning the NBA, you will have to test different Sports XBMC Add-ons ....!
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