I'm trying to find out if VIZIO S5430W-C2 54-Inch 3.0 Soundbar (2014 Model)
will pair using Bluetooth with VIZIO SB3851-C0 38-Inch 5.1 Sound Bar with Wireless Subwoofer and Satellite Speakers (2015 Model).
On most (all?) soundbars Bluetooth is "Input", so unless Vizio have developed something very specific, I don't think you can pair one bar to the other. Looking to the specs of these here and here I see nowhere such a capability.
What you are actually trying to achieve? Having the two bars play same music, somehow?