If there is no crease in the dome, there likely won't be any audible effect. With a metal tweeter though, that is more likely than with a soft dome. The M3Ti has a metal dome tweeter, and the waveguide partially protects it, so I am not sure how this person managed to get it dented (small kids possibly). The current M3 uses a soft dome, so there is a chance those drivers aren't available anymore. I'd look into that first, as the M3Ti is over 15 years old.