I own the Eidolon Diamond (moved up from the Eidolon last year). The Eidolon Diamond, Eidolon and Radian/HC all seem to have the same loading characteristics according to Avalon's website (4 ohms nominal impedence, 3.6 ohms minimum; not sure of rated sensitivities). My power amplifier is the 50 wpc Accuphase A-50V (which I also used previously with the Eidolon). I can't imagine that the Model 8 in all its versions would not have enough drive for your Radian HC's. I am not sure of the current capabilities of any of these fine amplifiers.
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