Netflix is rolling out spatial audio to hundreds of more titles, although the expansion is only available to premium-tier subscribers for now.  The feature offers a 360-degree, theater-like audio experience using only basic built-in stereo speakers and headphones. After introducing spatial audio last summer, Netflix has now added the feature to more than 700 of its top titles. Shows and movies that support the format are now labeled with a spatial audio badge. The immersive surround sound experience works on TVs, smartphones, tablets, and computers without the need for specialized audio equipment. Standard and Basic tier subscribers will still have spatial audio for a "small, select number" of movies and shows, the streamer noted. Also on Wednesday, Netflix said that premium subscribers can download titles to six different devices, up from four. Premium-tier Netflix, its most expensive plan, costs $19.99 per month in the U.S.