a device containing speakers (= devices through which recorded sound is played) that is used underneath a television, computer, etc. in order to improve the quality of the sound

If you want to improve on the standard sound that comes with your flat-screen TV, a good audio solution comes in the form of either a soundbar or a soundbase.

A sound base is a large, flat box that functions as both a speaker and as a stand for your TV. 音响底座是一个扁平的大箱子，既可以作为扬声器，又可以作为电视的支架。