I have a SONOS Soundbar and Sub. Don't want to use Play 1's for rear. Can this amp with wired speakers be set up for rear surround sound speakers?

You can connect a complimentary pair of speakers to your surround sound TV system, but they will not act like true rear surround speakers. I had B&W in-ceiling speakers as part of my old component system and now use them in conjunction with my soundbar and sub, but it's not the same thing. I hooked up a pair of 1's as "surround speakers" and enjoyed them until I sacrificed them to other uses throughout the house (bathroom and garage). I'll buy another pair of 1's eventually to add them back. Hope this helps...although you are already hooked.