As a last resort, maybe just put it up for sale as-is, no returns. Fully disclose the issue and that the company is out of business of course. Then let the market decide. You may end up doing well. These things are out there and people may want them for parts or believe they can fix them. You can put a decent reserve on it if you’re worried about having to sell it for nothing. If possible shoot a video of the dac’s sonic issue so there will be no misunderstandings later. Good luck.
Mike Powell's website is 11stereo.com.
https://www.11stereo.com/
Mike Powell's website is 11stereo.com.
https://www.11stereo.com/