from absolute sound class1 B&W nautilus system meridian dsp6000 system revel ultima system class2 infinity prelude mts system meridian dsp33 system thiel mcs1 / powerpoint system class 3 B&W cdm nt system martin logan scenario / cinema / script system snell acoustics k.5mk2 system class 4 m&k sound k-17 series 5.1 system magnepan mgmc1 / mgmc2 system psb image system class 5 acoustic research hc6 system cambridge soundworks newton mc300.5 system anthony gallo acoustics nucleus micro system paradigm atom system polk audio rm6600 system dahlquist system 3 ha! thats it, i am not gonna reveal more about the pdf file. only 5 bucks, just pay if you want to read more about it. i really want to hear those class 1 speakers. i can only drool at them at this point in my life.