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?

Showing 5 responses by redwoodaudio

Well, that's unfortunate!  Lots of speaker companies claim to have a focus on coherent imaging, but nobody has any idea how to measure it?  Do phase alignment/time alignment correlate?
Above... That was a helpful addition to the thread. Thanks! 

Otherwise, how are these multi-driver speakers solving this problem?  If there's engineering involved there's got to be some math or measurements of some kind.

Do any speakers truly image as coherently as single drivers? If so, there must be a theory. 
@djones51   Thanks for the tips about these other speakers
Time and what JA has to say about Vandersteen “imaging champs”....

Thanks for the helpful reply.  I just read JA's review of the Vandersteen Quatro Wood.  His measurements are interesting.

"Fig.5 shows the Vandersteen Quatro Wood CT's horizontal radiation pattern, normalized to the tweeter-axis response and plotted up to 45° to the speaker's sides rather than the usual 90°... The contour lines in this graph are impressively even, implying stable stereo imaging."   

"Like its predecessors, Vandersteen's Quatro Wood CT offers a true time-coincident output, due to the stepped-back sub-baffles for the upper-frequency drivers, the first-order crossover slopes, and the fact that all its drive-units are connected in positive acoustic polarity. Fig.9 shows the speaker's step response on the tweeter axis. The initial arrival is an almost textbook right-triangle shape, though the tweeter's output arrives slightly before that of the midrange unit. This confirms that the optimal axis will be 5° below the tweeter axis. Finally, the Quatro Wood CT's cumulative spectral-decay plot (fig.10) is impressively clean."


I do know that in the same room with the same equipment, my Omega single driver speakers had a much more coherent and precise image than my Klipsch Forte IIIs and a pair of Vienna Acoustics Mozarts that I compared a little.