Does Stacking Wireless Speakers Sound Feasible?

Back when Pioneer brought an Andrew Jones designed bookshelf speaker to market for around $130, there was some interesting discussion on some DIY sites about building vertical arrays of them configured horizontally. Not sure if anyone ever did it.

The LS50 being considerably more expensive, idk if it makes monetary sense but I do think it is interesting.

To your specific question about signal delay, are the LS50s connected to each other in any way? I assume that signal delay either isn't an issue or has been worked out by linking them somehow to a single reciever. I guess in either case it shouldn't impact a line array of them. 

A sound bar isn't a simple array. Generally they are either two clusters that are providing vanilla two channel stereo, or they are presenting the multi-channel mix, just all from in front of you. Some higher priced units angle the dispersion of the surround channels to bounce them off the walls first, perhaps enhancing the surround illusion.

What they are not doing is all playing the same mono or summed signal, which would indeed create a comb filter.