Thank you for answering and responding "Mind of CEntrance". (rare for company leaders)
I respectfully understand the proprietary approach as unfortunately these days companies like to copy-cat others hard work. Obviously one can get a AKM4490 test board for cheap on ebay but how CEntrance integrates a DAC chip will make a tremendous difference. With technical facts and collective experience It is harder and harder these days to go by overpriced "Faith" in a companies ability with Audiophile gear and pay to get on the "HypeTrain".
With the DACport's Class A low impedance high mwatt output, XMOS asynch- low to no jitter, No filter output caps, Custom Dac filter, Gain selector switch, Digital volume Pot . 10-40khz Frequency response. These are not just "Faith" designs but fundamentally proven "Sound" design approaches.
In regards to the DSD feature on the HD, (nice to have the choice versus for example Schiit not giving one). DSD is more a niche that was poorly supported by record companies who rather spend their money persuading the governments to police our internet privacy than provide a "high rez" standardized format. The core of the debate seems to find DSD vs equal "high rez" PCM to be just a different mastering versus 1 is better than the other. Sorta like how LP's are mastered differently and have appeal for those reasons. The advantage Native DSD brings is it helps prevent "bit manipulation" by the user or OS allowing us to hearing the Final Master but ironically DSD simultaneously allows custom output filters (the same as on board Dac built in filtering) via computer processing pre-signal sent to the DAC. (we get to play designer) (see hqplayer)
I myself will likely only use DSD 2-5% of the time. Still I went for the HD because I like to have features to play with.
If i wrote a review I would definitely quote ya here:
"Yes, we have spent months listening to the AK4490's multiple internal filters, but we didn't just choose one." "Nevertheless, we are very proud of the sound we have achieved and know that you will enjoy it just as much as we do."
Put me on the "Faith" bandwagon! (pride in ones creation is rare these days)
Since I may momentarily have your ear, My only critique with CEntrance is that it would be nice to have actual benchmark tests on your website for all of your products. Such as SNR, IMD, FR, THD at var. frequency and output impedance to represent the range of headphones, Dac linearity, Phase linearity, Jitter spectrum & pitch accuracy, Cross talk and channel separation, Square wave at various freq. , Transient impulse, Noise floor, Volume channel balance, Etc. All Tests at each gain setting (when possible) of all your devices.
Your likely to have some or most of these. Otherwise how could you insure you were not getting placebo "Faith" results? (Rhetorical and not questioning CEntrance's vast audio expertise experience) Functioning is easy to test, Functioning as intended often requires tedious bench marking with days of boring mind numbing setups and cross checks to insure results which often do not remotely even resemble the joy of listening. Correlating Data interpretation to what we hear gets even more complicated. Yet empirically certain tests do show us what we "hear".
If you did publish some benchmark data I and likely many others will jump off the subjective "Faith Bandwagon" to the "Super Fanboy" train based on pure objectivity with a passion for "Faith in the Designer."
That being said , I and likely others greatly thank you for providing a Most Excellent cost effective device.