I just received a pair of ERA 300’s.Eventually, I intend to use them a surrounds with an ARC and Sub, but first I want to hear what they sound like as a stereo pair. Hopefully, Sonos is working on a solution which will allow us to switch for stereo pair to surrounds, but in the meantime, to switch from stereo pair to surrounds must I revert to initial factory settings? I’m sorry if this question has already been posed.