Quote Originally Posted by topspeed
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As far as I know, there are only two topologies of switching amps currently in use: TriPath and ICEpower. BelCanto used to run TriPath but now uses ICE. We both know PSA runs ICEpower in the GC series, therefore it would seem that if he still insists on calling it SDAT, it would follow that the previous HCA was ICE as well. I remember reading an article that also stated such, although it's been so long I have no idea what magazine it was or when I read it.
If I'm not mistaken, Hypex' UCD technology is a separate Class D variant, different from Tripath and ICEpower.

Also, I believe it's the only one of the three that's available to hobbist buyers. See offering at DIYCable's website ...
http://www.diycable.com/main/product...roducts_id=576