The Bose 901 series speakers, which have been manufactured since 1968, probably qualify as having the longest tenure of any currently made hi-fi product. Although they have undergone a continuing process of design modification- and the Series V differs in almost every detail from the original Model 901-the basic concept of the system remains unchanged to this day. The design of the Bose “Direct/ Reflecting” speaker is based on the fact that most of the acoustic energy reaching a listener in a concert hall has been reflected at least once from the ceiling, floor, or walls. Dr. Amar Bose, president and founder of the Bose company, decided that in order to give a subjective effect more like that of a live performance, a similar proportion of a speaker’s sound output should be reflected from a home listening room’s walls.