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Message: <blockquote data-quote="Jeffdachef" data-source="post: 8672383" data-attributes="member: 650438"><p>flat is when it can play 25hz to 50hz with less than 1 db variation. Sealed is linear not flat theres a major output disparity between low notes and the 40 to 50hz notes in most cares due to cabin gain. OP's car is a corolla which has a hard 47 to 50hz resonant frequency that skews literally any sealed setup close to a one note wonder. A sealed box will be FAR from flat in his case. Sealed = you just stuck with the frequency response of your vehicle acoustics with no means of flattening anything out. 1/4 wave transmission lines are usually a lot better playing multiple octaves extremely flat bandwidth all around. Then there's 6th orders and basic bass reflex but tuned for SQ accuracy and bandwidth based on cabin gain measurements. </p></blockquote><p></p>

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