Vizio S4251w-B4 review - CNET aving you connect the speakers to the wireless subwoofer, rather than a unit that lives in your TV cabinet. If you place the subwoofer in the back of the room, you avoid having to run cables from the front of your living room to the back, which is what usually ends up causing most of the clutter. (The subwoofer does need to be plugged into an outlet.) Most manufacturers would call these "wireless" speakers, although Vizio thankfully doesn't, because, well, they require wires. The sound bar itself has a particularly refined look. Vizio has a penchant for glossy black finishes that tend toward tacky, so the S4251w-B4's understated matte black look is a welcome change. It's pretty much a "nothing-but-speaker" look from the front, with just a thin strip of blac with home_theatersound_systemspeakerssurround_sound