Radian and Ascents (I have the latter) are the hardest speakers to drive. Eidolon, Opus, and Ascendents are completely different.
For Radians plan on using something extremely powerful like 300WPC for bass and something > 70WPC for the mids and highs.
For Radians plan on using something extremely powerful like 300WPC for bass and something > 70WPC for the mids and highs.