Continuum s2 use 3rd party Class-d modules from Pascal.
http://www.pascal-audio.com/about-us.html
http://www.pascal-audio.com/downloads/M-PRO2_Data_Sheet-2_4.pdf
http://www.pascal-audio.com/about-us.html
http://www.pascal-audio.com/downloads/M-PRO2_Data_Sheet-2_4.pdf