Samsung Electronics said its new Galaxy Tab S3, unveiled at the Mobile World Congress in Barcelona on Monday, is optimized for entertainment with enhanced audio technology by Harman, the US car-connected products maker that Samsung is planning to acquire. Releasing the latest tablet two years after the unpacking of the Tab S2, Samsung said the Tab S3 comes with a 9.7-inch Super AMOLED screen and quad-stereo speakers tuned by the AKG from Harman for quality visual and audio experiences in movie watching.