Hi Rohit,
Yes, that's it. Class d audio. I only have the 120 watter. I paid around $140 if I am remembering it correctly.
I have to qualify my statement about my comparison with my class d amp and my tube amps. Presently I have 6 tube amps. One ST 70 with the Welborne mods, 3 pentode/single ended amps using Tubelab's boards, and 2 300B amps. I should have said that in some materials the highs of the digital amp sounded better than my tube amps. Godspeed.