the audio part... may be disappointing to u.
android boxes are primarily built to to stream VIDEO, not much attention to audio.
plus, most of the streams, esp free ones are 1.0, at best stereo like in youtube.
only netflix in approved boxes will give u DD5.1 or higher.
for local playback, there are all kinds... capability varies a lot depending on price, brand, model... from DD5.1 to Atmos, DTSX.
lastly, for china tv dramas, you can try browser based sites, which work on both android or windows.
google gimy tv, olevod tv, pianku tv... u see what i mean.
thx for yr reply n directions. exactly my thots on sound system. my old media player serves my purpose but hv not been using past 3 years cos usb port issue as i plugged in hard disk. mostly i dwnld wt the best possible audio n watch as w/o good surround i rather not watch except dramas. noob question, whats local playback?