Yes they are. I bought these from Apos Audio on 3/10/2021 so they are still under Apos’ transferable warranty until 3/10/2023: https://help.apos.audio/en-US/apos-audio-2nd-year-transferable-warranty-29442
They are in excellent condition.
Selling my Topping D90 (original non-MQA version) / Pre90. They sound amazing and in my experience the Pre90 takes the D90 to a higher level. Also includes a pair of topping XLR interconnects for the stack. Everything is in excellent condition. Asking $1000. Free shipping within continental U.S...
Interesting I checked the specs and both the “power plant” and the bk precision 9801 quote a spec of < 0.5% THD. PS Audio just performed to the spec while the 9801 far outperformed it in this testing.
That would have to depend on the dacs. The best $100 dac may even be better than some $1000 dollar ones, and I would think some people could tell the difference.