If I put two Sonos subs in the same (primary) room, which would likely be a room where I listen to Sonos products a majority of the time, I would likely want them to colour-match each other. simply because both would be seen in the one room by visitors etc. It would not matter, if they were somehow not viewable.
The second standalone sub in any ‘other’ (secondary) room, can be either black or white - that would not bother me too much. At least there’s only the one device and I would try to hide it if it did not match the speakers in that room.
There is always the option to add a cover to the standalone sub (not my preference) but it’s an option, I guess:
https://www.coloryoursound.com/speakers/sub-speakers.html
Only you know what sounds ‘best’. I think that the second SUB is great fun.
@Ken_Griffiths - I think we are in agreement about the colour co-ordination.
@buzz. In what way? Are to expand? thanks.
For music the goal is usually to recreate the original experience. We have all sorts of flowery words to describe the sound, such as ‘uncolored’, ‘’realistic’, ‘flat’, ‘smooth’, ‘good imaging’, and on and on. For movies we want a bigger than life result for the chase scene. A single SUB can be very aggressive, and will often rattle the walls and windows. Two SUB’s put more energy into the room. As I said, it’s “fun” (during the chase scene) for action movies.
A few traditional subwoofers had two settings one attempting to provide realistic music rendering and a more aggressive setting for supporting video. It would be easy to add this capability to a SONOS surround system.
Chanced it and ordered and 2nd one in black along with an Arc. Quite a wait for delivery though due to being on backorder. It’ll be interesting to see how the “ultimate” Sonos HT set up sounds - Arc, 2x Subs, 2x Play5 Gen 2 as rears.