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<blockquote data-quote="audioholic" data-source="post: 2789841" data-attributes="member: 549629">Port area is a rough way to get an idea how much air the sub/system is gonna move. Lets put it this way, if I bought an 18&quot; sub and the manufacturer only recommended 37 inches of port area, Id be extremely upset. My XXX 15&#039;s need about 50 inches for each, so 100 inches for a large displacement 18 sounds about right to me. *shrug*If you can&#039;t fit the port for an 18&quot; driver in your trunk, you can&#039;t fit a ported 18 in your trunk. Not sure what other answer you could expect. Certainly dont recommend cutting the port area in half or less.The smaller the port given the same air displacement, the greater the air velocity inside the port. The greater the air velocity inside the port, the greater the port noise will be. Think of blowing thru a straw, you can hear the noise the air makes as its released and turbulates at the mouth of the straw. Now blow considerably faster... the noise is greater. Basically the same principle at work.</blockquote>

[QUOTE="audioholic, post: 2789841, member: 549629"] Port area is a rough way to get an idea how much air the sub/system is gonna move. Lets put it this way, if I bought an 18" sub and the manufacturer only recommended 37 inches of port area, Id be extremely upset. My XXX 15's need about 50 inches for each, so 100 inches for a large displacement 18 sounds about right to me. *shrug* If you can't fit the port for an 18" driver in your trunk, you can't fit a ported 18 in your trunk. Not sure what other answer you could expect. Certainly dont recommend cutting the port area in half or less. The smaller the port given the same air displacement, the greater the air velocity inside the port. The greater the air velocity inside the port, the greater the port noise will be. Think of blowing thru a straw, you can hear the noise the air makes as its released and turbulates at the mouth of the straw. Now blow considerably faster... the noise is greater. Basically the same principle at work. [/QUOTE]

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