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The easiest way to add a subwoofer to your music system is with a powered subwoofer. The advantage of a powered subwoofer is it's simplicity. You need only plug it in, run speaker cables to it and place it in between your main speakers and your in business.
A well written instruction book will allow you to set the controls of the subwoofer which would include volume level, phase, crossover frequency, or bass equalizer. All of these settings will tailor the output of the subwoofer to your listening environment.