Describe the sound of point source loudspeakers?

It is difficult to describe but I'd say you could look for a near seamless integration between bass and treble.

My Tannoy Dual Concentrics are far from perfect, but they do have a sense of integration that is remarkable for speakers of that size.

Many would say that the distance between the centre of the treble and bass units doesn't matter if you are listening at a sufficient distance, but I'm not so sure about that.