I have the TT2 and the 1266 Phi (not TC). Without knowing your DAC and being a little bit familiar with the Violectric house sound I would say this combination is very fast, very detailed, spacious and airy, not soft at all. The bass of the 1266 is phenomenal! Very muscular, defined and prominent but not overbearing. The great thing about the 1266 is that you can dial in the amount and tightness to your liking. While I like bass and treble of this combo, I find the mids to be a bit on the lean and dry side. The JPS Superconductor cable will probably help but $$$. When needed, I use a Norne silver/copper fusion cable which costs a bit of resolution and speed but gives a nice midrange.
One thing to note is that the 1266 benefited greatly from connecting it to the rear XLR sockets (more power) in terms of improved speed, tightness and staging. From what I read in the headfonics review I suppose it’s similar with the Diana Phi (they paired it with a 100W Chord TToby).
I’m waiting to travel to be able to pick up a new TT2 and a Diana Phi waiting in my office. I purchased a corpse cable adapter for the rear dual XLR to 4 pin XLR. I then have a 4 pin XLR cable hooked to my Diana’s. Anything to consider before using the Diana Phi’s plugged to the back of the TT2 to avoid a costly mistake? Did you find a significant difference between balanced on the back vs SE on the front? Do you feel happy on how the TT2 drives your 1266 by itself? Thank you!