Must speakers have certain volume to sound convincing ?

I think any speaker has to play loud enough to:
1) sound convincing or somewhat realistic
2) portray dynamics
3) pressurize the room
4) reveal, or at least, plumb the lower regions convincingly
5) reveal ambience
One can always go louder but I find that proper matching (or just serendipity) can negate the need to go really loud and still be convincing.

All the best,
Nonoise