The Bose 901 II is a loudspeaker system produced by Bose Corporation. It was originally released in 1978 as an improved version of the original Bose 901. The 901 II features a unique design known as the Direct/Reflecting speaker technology, which utilizes a series of nine full-range drivers to reproduce sound. The speakers are designed to be placed against a wall to enhance the reflected sound, creating a spacious and immersive audio experience. The Bose 901 II is known for its distinctive sound signature and has a dedicated fan base.