Sonos design their speakers with a balance between the power output of the amplification circuitry and the speakers they match to it. In other words, the speaker can handle the “volume” the amp plays to it. With active amp-and-speaker kit, it’s not the same risk as passive speakers being mis-matched to more powerful amps.  So at least theoretically they should be ok. But, if an over-voltage occurs the speaker could be stressed.

In my audiophile days I used to run speakers that were under-rated for my amps but I knew this and never turned the volume to 11 (some folk will get that reference ). It’s usually when the amp is overdriven - played at high volume for too long and then is expected to produce a “louder” sound in the song - that clipping and ambients occur, and that’s what usually causes damage. 

I just have to jump in here to ask: How big is the room that you have the Arc setup in? 

My living room is a good size and I sit about 15 ft away from my Arc. I have 9 ft ceilings. I have never needed to crank the volume past 50 for any content.

I cant imagine The Arc at max volume!

I think op was referring to a bug a while back that resulted in a full-volume hammering sound, typically stopped by pulling the power cord. Yes, it was loud. But you may be right: they might have meant loud explosions in a soundtrack already being played at high volume. 

Room is 4.5m by 4.8m . I thought the movie was too quiet so I tuned up the volume but it bang all of a sudden. Mine is LG G3 connected to Arc , sub and Errand .