Maximum performance from Bose's flagship speaker system. The 901 series speakers re-create the impact, clarity, and spaciousness of a live performance by reflecting most of the sound off walls and other flat surfaces, instead of aiming the sound toward the listener like conventional speakers. With Direct/Reflecting technology, anything you listen to--from the latest DVD audio to your favorite vintage vinyl--acquires lifelike realism, because the speakers reproduce the natural concert hall balance of direct and reflected sound. Stereo Everywhere performance is clear and lifelike everywhere in the room, not just in one sweet spot. The Acoustic Matrix enclosures provide clear, well-defined low frequencies as speaker chamber noise is dramatically reduced. The 9 helically wound aluminum voice coils in each cabinet are designed for higher durability, greater efficiency, and superior power handling. The Bose Lifestyle 901 EQ 1915 Series VI active equalizer (sold separately and required for proper operation) helps you enjoy smoother, more natural balance and clarity throughout the audio spectrum. These speakers are also a great choice for use with your surround receiver.