Mmmmmm old RF goodness. I used to have a ton of these amps, 40,100,200.. in dsm and ix line. The IX simply has a crossover card built in to it, otherwise the same as dsm. Power wise, on good electrical, expect ~40 percent over rated power, these were in the heyday of cheater amps. They are also regulated, so low voltage doesnt drop too much power, in return high voltage wont do much for you either
Edit: I remember birth sheets of my 200's doing over 700 watts [email protected], Take that with a grain of salt though.