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Message: <blockquote data-quote="squeak9798" data-source="post: 866335" data-attributes="member: 555320">3db is technically twice the output.  To increase output by 3db, it requires a doubling of acoustical power.  So, being 3db louder is technically twice the acoustical power.However, humans have very insensitive hearing...especially in the low subbas frequencies.  It typically takes an increase of about 10db to be perceived as "twice as loud".Going ported will generally give you an increase over sealed of about 3db over the entire bandwidth (all the frequencies being played).  However, depending on the box design/tuning frequency and such....ported can have as much as 6-9db more output at a certain frequency over sealed.</blockquote>

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