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Luke ... Taking a look at a sealed and a ported sub, and we have two "knees" at which the response curve starts dropping. In a sealed box, it is typically around 40-80 Hz (that will vary based on size of box, drive used, etc ...) and will roll off at 12 dB per octave below this point. This is...

Jman - Actually, you are both right in the context of what we actually experience with our ears. Keep in mind that we are dealing with linearity, and a properly designed ported box will play deeper with linearity than will a sealed box. One can take a ported design using a given driver and...