technically yes. though unsure if you intend to go quadraphonic (one soundbar behind, one in front for 4.0) or 5.1 or some other odd setup. you did not explain in detail.
generally soundbars get paired up with two wireless rear speakers to fill in the rear channels. that is likely the better choice here. the whole selling point of soundbars is space saving not sound quality although it is true some do not sound bad at all.
if you wanted a true 5.1 from the start, going the whole receiver, 4 speakers, center speaker and sub route would have been better.
how to send signal? any 5.1 analog (6ch) output. or extract it from hdmi with one of these
working with active speakers and 5.1 is more of a pain than using passives with a receiver though