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Message: <blockquote data-quote="helotaxi" data-source="post: 7055542" data-attributes="member: 550915"><p>A sealed driver cannot match the low frequency output of a ported one.  Sealed boxes can be used to get fairly low in a car because of the cabin gain from the small listening space.  As you increase the size of the room the cabin gain decreases until you're effectively in free air.  At that point you're getting nothing from cabin gain and the sub system has to produce the desired frequency response all on its own.  Most all sealed subs begin to roll off in the mid 50 hz range and have 3dB down point in the mid to high 40s if not higher.  That puts them about 9dB down in the mid 20s where a low tuned ported enclosure is only 3dB down.  That's a 6 dB difference or the same as running 4x the number of subs or 4x the power or 2x the subs and 2x the power.</p></blockquote><p></p>

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