Rebbi,
I like the De Capo a lot; but I like both Tektons much better. First, the bass is really, really good. Remember, I am a bass player. The Tekton is easy to drive, benevolent 8 ohm impedance, 95db, 98db efficiency, 38hz or 30hz bass. They throw a huge stage, in my room usually wall-to-wall if the recording has it, deep and nicely layered. The height is normally close to life-like. Female vocals like Ella check. One of my go-to Jazz CDs is: Louia Armstrong/Duke Ellington, The Great Summit/Complete Sessions/Delux Edition. You want to talk "truth of timbre", harmonic rightness, natural organic sound this CD will show it in spades, full, rich, just glorious! I feel like I'm in a small club and Sach, Duke, everybody is there in all their life-sized reach out and touch them. Louis' trumpet, the Duke's piano, Trummy Young's trombone doesn't get much better, Barney Bigard on clarinet is so live I had to invite my niece over to play hers to compare. If only she had Barney's talent...Danny Barcelona on drums, cymbals and brushes so perfect, and last, but not least, Mort Herbert playing a five foot tall bass that nailed strings slapping with buzz and body, the notes just floated so naturally, nice decays. This is not hyperbole.
On a classical recording such as Bartok Concerto for Orchestra, Music for Strings, Percussion and Celesta, Hungarian Sketches (Fritz Reiner, CSO) on RCA Living Stereo, the dynamics are phenomenal. This is truly a great recording to test your speakers. That big U of orchestra is there and it is easy to pick out all the instruments in their rightful spots.
I have no connection to Tekton. I have enjoyed quality sound both live and recorded since childhood on some of the best audio stuff ever produced. For $1,500 bucks you can get 90% there. As alway YMMV.