... power area, CA series amplifier have 2U-3U higher selection, and 150W-1100W power area, CA series had some pursuits ... for faster of reaction speed higher of damping factor, and greater function, higher level of protect function,production technology ... .775V/1.0V/1.4VProtectOverheat short circuits,DC,limit and--softstart,Output relay-Zero Current Switch,Intellctual Clip limiterHeigh2U2U2U2UCross ...