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what does this mystery tick box actually do? I am running Sub in a room with two PLAY:1s.
According to the FAQ, it's Placement Adjustment (phase): Check to turn on; uncheck to turn it off.
This thread may shed some light..... or sound. Or maybe not....



https://en.community.sonos.com/wireless-speakers-228992/what-does-the-sub-placement-adjustment-do-5938430