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This is the cone excursion of your sub. Yellow is 200 watts with no hi pass filter. The sub will start to bottom out at about 15 hz. As long as you go easy with the Rotel you'll be fine. Green is with 500 watts and a hi pass filter at 18 hz. Without one the sub will start bottoming out around 17 hz where there is a lot of low frequency information on DVD's.

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