So I had 2 play 5 gen 2s using a line in and optical adapter from my tv paired with 2 play 1 as rear “surround” speakers. This weekend I bought a Sonos arc and connected the 2 play 1 as the surround speakers, it’s awesome. 
 

however when I paired it with my 2 Sonos play 5s (which are in a stereo pair) it had an echo. I was able to adjust the tv dialogue sync to +2 and it fixed it. 
 

however my question is, is their a way to pair them with the arc so it reads as an entire system. I use Google tv and the remote will control the arc but not the play 5 volume. My hope is to find a way to pair all 5 speakers together as one. Any tips would be appreciated. 
 

in a perfect world I’d love to be able to pair them all together and have the low end come from the play 5s. 
 

I realize this is overkill, trust me I’m married, I’ve heard it. So just helpful tips no judgement on my choice to go deaf by 50.