Sorry for the late reply
Here come the answers for the question you concerned and hope they are helpful for you:
1) What is the latesrt firmware version for the HM901 and where can it be downloaded?We just announced the new firmware for HM 901 and other modules. And here is the link to download it: http://down.head-direct.com/2.004/hm901/update.zip
Here are links for other modules:
2) Will there be future firmware updates for the HM901, or is it a orphaned product?
yes, it isn't a orphaned product.
3) The HM901 is still for sale at least in the United States, if it has been "discontinued". Don't you have an obligation to inform potential customers of this?
Yeah, HM901 is not for sale on our official online store like head-direct or our ebay.amazon store but our dealers may still have it in stock so it is still for sale now
Yeah, Sorry for that we didn't make a public press release and that's our fault.We have made a discountinued sign when you put you mouse on HM901 on hifiman.com . so does HM802 .
4) What exactly is the upgrade process for current owners of the HM901 to the newer models?
We have a upgrade process for HM901 to 901s which means the HM901 owner can pay $499 and send back the HM901. We will send back a new HM901s which can't be refund but still enjoys one year warrenty. But now HM901s is in high demand so the offer is now limited now.
5) What are the differences between the HM901 / HM 901S and HM901U besides price?
HM901U has better treatment of noise than HM901.
HM901S differs from HM901 and HM901U. It has much better stereo isolation and musical quality.
Both HM901U and HM901S are equipped with TAICHI UI. However, HM901S does have faster power on/off in three seconds.
HM901S has no high/low gain switch on side of the player.
Compared with HM901U, HM901S has much better stereo isolation and musical quality.
6) When will the DSD option be available for the HM901?
Now HM901can now play music in DSD format (Direct Stream Digital, which includes DFF and DSF files).
HIFIMAN Customer Service Team
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