According to SMSL and confirmed by Amir's tests the Sanskrit 10th MKII has a max output of 2.2Vrms.
I connected my Lavaudio DS600 v1.1 (max 2Vrms I think as per Amir's test) and with Windows 100% (no effects) and Spotify 100%, -35dB and H1 gain (0dB) the K371 volume was louder than I ever play them, but not distorting/straining. I am old and probably played at -35dB when younger. -40-45 is about max for me now.
Substituting my E1DA 9038D DAC (set to -.5dB = max output of 2.66 Vrms), a10h again at -35dB H1, the K371s were incredibly loud. At -35dB I could not tolerate them for more than a second. -50-5dB would be plenty for me. So, like solderdude, I am pretty sure nothing is broken. The AKG 700 series is pretty hard to drive, and 15dB additional potential gain is a lot.
BUT, see solderdude's previous post #2 in this thread. I have seen no measurements, but it is speculated that the a10h, like the Topping L30 will not reach near its full rated output using a DAC with 2Vrms max. In use, including use with 600 ohm DT990s/880s, I never found this an issue with either amp. Topping has defended their 9+ max gain by saying that owners can be certain that they will never overdrive the amp even at 0dB Highest Gain.
Others may disagree that this was the right choice.