The T2 is much better then the D2, the D2 is based on the older D1 platform with a few updates.
The new T2 is based on the X1 and shares some of its technology and sound quality just not as much of it.
The T2 uses dual Ess Sabre 9028 pro chips vs the X1 which uses dual 9038 pro chips which are even lower in distortion.
The analog stage does away with the expensive Luhendel transformer and external power supply.
So the take away is the T2 is superb sounding and dramatically eclipses the sound quality of the older platform and offers some of the magic of the T2, the image float and density of the X1 is extraordinary, you get some of the same sound just not as magical.
However for the price the T2 is pretty special.
Dave and Troy
Audio Doctor NJ Lumin dealers