AT-01S is a passive sound bar matched with AT-01A. It has built-in 8 channels and 12 speakers. There are left, center and right channels on the front. Both are composed of 3-inch bass and soft-film treble. Working mode, two 3-inch full-range speakers on both sides form a left and right surround, and two 3-inch full-range speakers on the top form a reflective overhead channel. There are also two 4-inch high-power speakers on the front to form a double bass to produce a strong subwoofer.