IME, speakers with good measured step and square wave responses tend to image well.
Is there measurement that correlates with cohesive/pinpoint imaging?
I am currently using single-driver Omega alnico speakers which have the most coherent imagining that I've ever heard. However, if I wanted to compare them with other speakers (including multi-way speakers with crossovers) in that regard, are there any specific measurements to account for? Would measured delay between driver signals in a multi-way speaker be a useful proxy?