Cayin was among the very first Chinese brands to become somewhat well known in my neck of the woods. And interestingly enough, some of their first major exposure came from a June 2006 Stereophile review of their HA-1A headphone amp, back when the headphone market was quite a bit less prominent. The HA-1A earned a recommendation as a Stereophile Class B component and hung around for 6 years before dropping off the list. That's a very strong run which not many components can claim, though I admit a lack of competition may be partially to blame in this case.
Read more at http://www.innerfidelity.com/content/cayin-idac-6-and-iha-6-dynamic-duo#whqZHTzIi6ExJEJr.99