it take I several hour to figure out that the back speaker wire -lrb- and associate plug -rrb- be not attach to the plastic casing that cover the connection port on the speaker . the wire be loose through a hole in that plastic cover\/housing . Vizio could have mention this configuration in the manual , with some sort of easy picture ... but NO. . I think there be some other issue with the unit that I keep try to diagnose . plus , I keep see review and complaint about how the back speaker do not work for some folk . finally , before call they support line -lrb- which I be scare to do -rrb- , I try one last time and luck out to find this configuration . what you need to do be pull some of the wire through the plastic cover\/casing . then , connect the wire\/plug to the back speaker connection , make certain that the plug be secure\/firmly in the outlet . finally , move the plastic cover along the wire and attach the cover to the back of the speaker . TA DA ! it work . it be so stupid and I be so angry for they not be any specific advice about this anywhere -lrb- even on the internet -rrb- . the only thing the manual mention be : the wire to the back speaker may come loose in transport and may need to be reattach . however , the manual do not tell you , specifically , how to reattach that wire . I hope this help those who be have fit , like I do . beyond that , this piece seem to be a pretty good solution and sound pretty good , or at least good enough for my sister : - -rrb-