Bose 901

The Series I (“9 Rave Reviews!!”) were just getting the Bose propaganda machine warmed up.  Series II are the ones to look for. They had the drivers custom made, not off the shelf as in S I.  Yes they needed power because of the steep bass boost.  To make them more commercially viable Series III brought in the use of injection molded plastic cabinets and vented loading, and entirely different EQ shape. They were no longer remotely interesting and have remained so, IMO. 

The monster Bose power amp MC refered to was 250 WPC, not 350 (that was the Fizzle Linear at 350), and it featured a distortion curve that rose steadily above the upper midrange, no doubt due to minimal open-loop bandwidth limitations on the output transistors.  But with no actual tweeters...who cares!  But it was a beast.  After Series III came out they stopped making it.