Bose 901 Series — 4 Speakers & Equalizer SystemAmar Bose built the 901 around a radical idea: that live music in a concert hall reaches your ears mostly as reflected sound, not direct sound. So he flipped the physics. One driver faces forward. Eight face the rear wall. The room becomes part of the speaker. The result is a soundstage that fills a space in a way that conventional box speakers simply don't wide, enveloping, and effortlessly musical in a way that makes long listening sessions feel