It all depends on the circumstances. If the crossover frequency will be high(>100Hz) and/or the low pass crossover slopes small (<18 db/octave), stereo subwoofer are more necessary because they will operate into the area where the ear can localize the source of sound more easily. The best way to test this is to play music with only the subwoofer operating. If it can be localized by listening then stereo subwoofers are called. Using two or more subwoofers (stereo or not) can result in a smoother frequency response in the bass although this will require more thought and experimentation in the placement of the subwoofers in the room. A sound meter and test discs will greatly aid in properly setting up any subwoofer in any case. Good luck!
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