Do I need more than one powered subwoofer for my home theater set-up?

Unless the listening room is exceptionally large, you should not. The average listening room is about 1500 cubic feet. That is a room roughly 14' by 14' with an 8' ceiling. A good quality 10" or 12" subwoofer will generally produce sufficient levels in this size room for most listeners. However, if more extreme output levels are desired, or if the room is very large, multiple woofers can be used to achieve the desired output. Also, often a single subwoofer will sound good in some locations within the room, but lacking in other locations. Using two subwoofers may help "even out" the bass response throughout the room.

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