In the late ‘70s, my buddy managed an audio shop. They carried Accoustat, SOTA, ESS, JVC, some other brands that I don’t recall, and Bose. The Bose rep came in one day to demonstrate a way to really impress people and boost sales. He put on a Red Rider LP, started a track, and turned one of the Bose 901s around so that the ports faced into the room. He then produced a lighter, lit it, and held the flame a few inches in front of one of the ports. At a certain point in that song, enough air came through that port to blow out the lighter’s flame. “Dang!! Not only do those Bose (pronounced “Bow-Zee” by the upstate SC audio cognoscenti) sound good, but they can blow out my lighter, too!” It’s hard to imagine a stronger or more practical selling point. I don’t recall our being able to replicate that amazing feat with the Accoustat 4s!