We have a Sonos Arc, Sub and 2 Sonos One rear speakers and they sound amazing.
But after adding a 2nd sub and calibrating Truplay the sound is not good at all.
Voices are like they come from a small speaker in the TV, surround sound is noticably less and overall it does not sound like an improvment at all.
I did Truplay calibration multiple times but that does not help.
For now i removed the 2nd sub, recalibrated and now the sound is great again.
Thinking of returning the 2nd sub…..