pekingduck
Headphoneus Supremus
- Joined
- May 16, 2009
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http://hifiman.com/products/detail/266
... Besides the bundled amp card, I didn't see any differences between HM901S and HM901U so far.
According to my understanding: HM901U = upgraded HM901 which has an inferior digital out and less powerful CPU when compared to HM901s.
First post updated.
I asked Alvin at Hifiman
"HM901U is only available in domestic market, which is like a update of HM901. Its appearance looks like HM901s, but is made of plastic, the HD button has been removed, and the balance and normal switch has been changed to 2 separate headphone jack."