Advise on the new FX wireless speaker!!

reisdokj
reisdokj Posts: 1
I am going to be moving into a house with a very open floor plan. This is going to cause a problem trying to hide all of the wires for my 7.1 HT system. I currently have a Onkyo TX-SR806 with Polk Monitor 70 fronts and a PSW 10. I have other speakers for the complete system from a previous Onkyo Home theater system in a box.

My big question is..... Would buying one of Polk's new FX wireless speakers be a good substitute for my back speakers?? If I buy two of them would it be good or bad to try and cancel out the Left side and left rear as well as the right side and right rear speakers. So instead of having 4 surround speakers, just 2 FX wireless speakers??

With theses speakers being up around $400 I wanted to get some advise before I purchase them.

Thanks!