The follow statement is in the Bryston SST2 Brochure. From what I can determine from reading many posts on the 2B SST2 this may not be a true statement.  The 2B SST2 uses 2 transistor output, not 4 like the 3B and above.
All SST2 amplifiers use Bryston’s proprietary output stage, which we call “Quad-Complementary.” 
Am I right, or just confused?