Just the ST version. I found the price between ST and SST was too great of an overall improvement.
Well for quality its better sounding than my Rotel which was not a slouch at 120w x 2 or 100 x 5. It definitely was not louder but low level information is definitely much more, soundstage and imaging specially mated with the PMC mains I currently run.
Remember the pro version over ST is just the extra balanced connections. You would only benefit if you run XLR interconnects. If running unbalanced RCA interconnects there is no difference. As per some people that have told me.
Saturn
