Summary: Bose 901's are the industry standard for speakers in this price range. They do not dissappoint. Across the whole spectrum of human hearing, highs and especially lows, are clearly heard through these speakers. Nothing I say about them matters very much, because they must be heard to be believed.
Summary: If you are shopping for the Bose 901 VI, the first thing to concider is if you can properly place these loudspeakers. The PDF manual is available at Bose.com. To sum it up, you need an available flat wall for the 16 rear speakers to reflect off of, while keeping them 8-18" away from that wall.
Summary: These speakers love power, the more the better. I drive them with two Parasound A21 rigged as monoblocks, 750 watts each. If you can afford the amp power, you will be rewarded with outstanding sound.