Must speakers have certain volume to sound convincing ?

I've found that different recordings have a loudness sweet spot where it sounds right, Peter Walker of Quad fame said this many years ago.
That sense of aliveness with all its tonal colours and dynamic shading is gold when it isn't driving me from the room, you know what I mean when your head is trying to tell you this is great and your heart is hiding under th couch, maybe that's what fatigue is.