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Most modern recordings, whether they are music or movies, contain a lot of program material between 50 Hz and 100 Hz. Many movie effects are in the 20 Hz to 50 Hz range (and a few organ notes). Although most modern speakers can reach below 100 Hz, it sometimes makes more sense to have a dedicated subwoofer to cover the bottom end (especially if you're planning a home theater). Once your main speaker's woofers are freed from covering the sub-bass material, they'll play with less distortion and handle more power.