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Stupid port question
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<blockquote data-quote="Immacomputer" data-source="post: 4966588" data-attributes="member: 570419"><p>What I was saying is that port area should not be determined by box volume alone. Motor strength, cone area, throw, and space limitations are MUCH more important in deciding how much port area to use than box volume is. Box volume does need to be accounted for because as the box gets larger, the spring force becomes smaller which will give you a little more throw from the drivers which would lead to a small increase needed in port area.</p><p></p><p>You're 100% right though about not always going with the bare minimum; I was stating that in the case where space is very limited to help keep the enclosure size down. And about SPL being a different situation. In that case, you do want as much port as possible since it will be the primary radiating surface when playing around tuning. But even then, if you don't have a sub(s) strong enough to drive a ridiculous amount of port air mass, then you're not going to be very loud with all that port. And if you go too large in the ratio of enclosure volume to port volume, you end up with a port that doesn't radiate but becomes a transmission line.</p><p></p><p></p><p>You shouldn't ever rule out other enclosure possibilities just because you haven't heard a setup that was built to what you prefer. My current enclosure is a transmission line and it sounds far cleaner, plays lower and flatter, and is much louder than the sealed boxes I have used for the same driver in the same vehicle. And just because a setup is ported, does not mean that it will perform terribly at 55-60hz. Do realize though that your vehicle will probably not give you much gain above 70hz so the response of a sub can sometimes seem like it struggles with higher frequency bass. In order to have a proper stage at the front of the vehicle (speaking for SQ), you don't really want your subs playing much higher than 70hz anyways as it can draw the stage back to the rear.</p><p></p><p>As for the HDC 18s, you can't just throw any sub into any sealed box and expect it to sound good. With those subs sealed in a vehicle, you're probably not going to have a flat response down to 20hz and you will probably be left with something that is very loud in the 45-55hz region. This will be very dependent on the vehicle though.</p></blockquote><p></p>
[QUOTE="Immacomputer, post: 4966588, member: 570419"] What I was saying is that port area should not be determined by box volume alone. Motor strength, cone area, throw, and space limitations are MUCH more important in deciding how much port area to use than box volume is. Box volume does need to be accounted for because as the box gets larger, the spring force becomes smaller which will give you a little more throw from the drivers which would lead to a small increase needed in port area. You're 100% right though about not always going with the bare minimum; I was stating that in the case where space is very limited to help keep the enclosure size down. And about SPL being a different situation. In that case, you do want as much port as possible since it will be the primary radiating surface when playing around tuning. But even then, if you don't have a sub(s) strong enough to drive a ridiculous amount of port air mass, then you're not going to be very loud with all that port. And if you go too large in the ratio of enclosure volume to port volume, you end up with a port that doesn't radiate but becomes a transmission line. You shouldn't ever rule out other enclosure possibilities just because you haven't heard a setup that was built to what you prefer. My current enclosure is a transmission line and it sounds far cleaner, plays lower and flatter, and is much louder than the sealed boxes I have used for the same driver in the same vehicle. And just because a setup is ported, does not mean that it will perform terribly at 55-60hz. Do realize though that your vehicle will probably not give you much gain above 70hz so the response of a sub can sometimes seem like it struggles with higher frequency bass. In order to have a proper stage at the front of the vehicle (speaking for SQ), you don't really want your subs playing much higher than 70hz anyways as it can draw the stage back to the rear. As for the HDC 18s, you can't just throw any sub into any sealed box and expect it to sound good. With those subs sealed in a vehicle, you're probably not going to have a flat response down to 20hz and you will probably be left with something that is very loud in the 45-55hz region. This will be very dependent on the vehicle though. [/QUOTE]
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