I have no idea what the Mk2 is, I just saw someone mention in the HF Stax thread that such a thing existed but don't know if it's actually real. If it is, doesn't seem like it has hit the North American market yet. In regards to the SR202, I thought it didn't have very good extension in both bass and treble and it had a kind of plasticky sound. It definitely helped to plug it into the SRM-1 Mk2 though since I thought Dusty's amp (I will never remember the model number) also sounded kinda plasticky, and also grainy in the treble. I don't remember beyond that.