MHDT Labs, a Taiwan based company, started producing their own multi-bit/R2R DACs in seeking pleasing but accurate sound to the 4 founders of the company. Their earlier models, Constantine and Paradisea, were some of the most musical DACs I've heard but without sacrificing a whole lot in detail and resolution. Fast forward some 10 years and they now offer several models ranging from AD R2R chips to the more common PCM1704.
The name MHDT comes from an acronym of the original 4 founders and the first letter of their Zodiac signs (Mouse, Horse, Dog, and Tiger). The acronym meaning was later changed to Music Heaven Development Team but given the time of the year and that Lunar New Year is upon us (Feb 7th on this side of the globe), I would prefer the original meaning of the acronyms of the name.
The original focus of the company is to create a musically pleasing sound that catered to the liking of the founders. What it has evolved into is an accurate recreation of sound and timbre of instruments and vocals while remaining musical to ones ears. Searching around the net will yield many reviews from many in the speaker side of audio but using these DACs with headphones has shown the amazing accuracy they're able to reproduce from the digital files.
A little disclaimer: their website is a bit of a throwback in terms of layout, just part of the company charm I suppose. Most e-mails are answered directly by Jiun himself and I believe the company while creating fantastic sounding DACs, may be a bit slow on the response as it is a smaller company compared to Audio-GD. That should not detract you from the company, however keep in mind if you do make inquiries. Lastly I'm not associated or affiliated with the company, just another enthusiast who really likes the products.