I don't think your question or concern is at all invalid.
When we were looking around to purchase our system we had several requirements in mind, one of which was a speaker system that could perform at regular (low) listening levels and yet be able to pump out some powerful sound when required (relatively infrequent).
As i sit downstairs and read a book or play with the dogs, i often turn on my Axioms with some music and play it at a reasonable sound level.
Personally i have not noticed any change in the speakers across volumes although any of the brightness often referred to as being characteristic of Axioms is very decreased at lower volumes. This seems to make the Axiom sound even more smooth and yet still very clear.
