RIGATIO
Headphoneus Supremus
I compared the dx311.2 and 12 with the sp2kT. Ak sounded bit better than the 11.2 but with the amp12, the performance was on same level. Slight differences in presentation. The dx312 was smoother in hights and less peaky but bit more distant than the sp2kT. With some pairings, even the amp11.2 sounded better than the sp2kT. Now, with the modified amp12EXN, from my memory, i would put the dx312EXN higher. But of course the price is less competitive- 1700e for the dx312EXN and the ak becomes quite a good deal, with 2 amps on board and "only" 500e higher in price. Have also compared the Alpha to the dx311.2 but it was quite brutal for the AK in this case.
The sp2kT is a very good dap.