Well I never compared them side by side so I'm going off memory.
As expected the high frequencies are similar on the two designs. The main exception being some narrowing in the pattern above 12k on the coaxials where the HF horn becomes more exponential in that last octave, while the waveguide on the Titan is constant directivity. So past about +-20 degrees your loose some of the airiness or very top end sizzle in the treble range while the Titan exhibits a more gradual or consistent falloff. That said the top end narrowing on the coaxials isn't too different then the off axis response of some of the larger dome tweeters where the best sound/flattest response will be mostly on axis.
The midrange on the Coaxials do sound more cohesive and natural but perhaps a tad less transparent then the Titan. I prefer the bass response of the 15" Coaxial to the Titan-615LX, seems to be more effortless and hit with more impact then the Titan but it was also in a much larger lower tuned cabinet (6.5cuft ~35hz vs. 4cuft 40hz). It's not capable of as much bass output as the Titan but you still need a big amp to reach it's limits.
I'd take the Coaxials over the Titan for music especially when used in a larger tower enclosure but I think the Titan is still better for home theater use when you want a larger sweet spot and better coverage for multiple seats.
Last edited by mtg90; 12-03-2019 at 10:21 AM.