I can tell you the DI's are extremely coherent with no phase interference or resonant issues.I've down some frequency testing on mine with the proper equipment and I'm just amazed with the results.
They sound nothing like the average line array that require very complex crossovers,the DI's crossover is quite simple and I believe Eric has a real winner here,I can see keeping my pair for a long time and I'm a very picky fussy audiophile.I probably in time will buy a 2nd pair for my 2nd system,that's how good I think they are.
Even though I bought a upgraded pair I have upgraded mine further and I won't comment on that because It's Eric's patented design.
If you get a chance to listen to a pair I would highly recommend it.
Kenny.