Just wondering what class amp they are and are the wattage rating specified for PEAK or RMS ?

The Model 2200 is an evolution of the Model 200, so I feel pretty comfortable pointing you to this post from Scott back in December 2002 in which he described the manner in which the Model 200 moved from class A/B to class G. As I understand it, the 200W (at 8 ohm) rating is a sustained figure, not a peak.