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Sealed box for 4 12's
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<blockquote data-quote="Moble Enclosurs" data-source="post: 7728695" data-attributes="member: 634917"><p>Hey Guys,</p><p></p><p>Well, as far as using the amount of subs and displacement within a trunk, and as long as the box is sealed, you will not notice much of a difference from a sealed obx of the same or similar volume if they were on the same baffle. If you were using them for a larger "room" then that is where the phase differences will start to matter more, but since they are low frequency waves, and you are using them in a vehicle, 90 degrees on either top, bottom, left, or right will not make a big difference with a sealed design because it already has a smooth phase from minimized cancellation acoustically anyhow. The only issue you would run into is if you were wiring them incorrectly in this case, BUT if the enclosure is large enough (though in this case it is not), it can make a difference as well regardless of the environmental factors.</p><p></p><p>SO, for 4 12s in a vehicle in an averaged 1 cube per sub, you will not have many changes from that of a single planed baffle design, with the exception of wiring phase. Now, you WILL notice a drop in the lower range a BIT more than normal if you were to compare, but it should be less than an audible difference greater than 3dB.</p><p></p><p>Simply put, with enough power, and the correct wiring (as 90 degrees is not a major change in phase at all) you will be fine, but do not expect it to outperform more efficient layouts or styles (ported, tapped, quasi, etc).</p><p></p><p>The idea of isobaric in this situation is not a bad idea if running sealed. Mainly you will notice an increase in output from 2 drivers and not a notice in response curve cutoffs. So, they will "perform" quite similar to a dual 12 setup with double the volume, but with the ability to increase power handling and control from a smaller volume. In turn, that will flatten out the response more.</p><p></p><p>The more compression you have at the listening area, the more smoothness in the curve will be noticable. For example, those with 6th and 4th order walls that get a great amount of passband range. That is due to the ratio of box volume to cabin volume being closer to a 1:1 than say a 2 cubic ft box in an suv. The more compression you have, the better the output and with power as a factor in relation to output, the more efficiency you will have AS LONG AS you have the power to run your setup efficiently.</p><p></p><p>Hope that helps!</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7728695, member: 634917"] Hey Guys, Well, as far as using the amount of subs and displacement within a trunk, and as long as the box is sealed, you will not notice much of a difference from a sealed obx of the same or similar volume if they were on the same baffle. If you were using them for a larger "room" then that is where the phase differences will start to matter more, but since they are low frequency waves, and you are using them in a vehicle, 90 degrees on either top, bottom, left, or right will not make a big difference with a sealed design because it already has a smooth phase from minimized cancellation acoustically anyhow. The only issue you would run into is if you were wiring them incorrectly in this case, BUT if the enclosure is large enough (though in this case it is not), it can make a difference as well regardless of the environmental factors. SO, for 4 12s in a vehicle in an averaged 1 cube per sub, you will not have many changes from that of a single planed baffle design, with the exception of wiring phase. Now, you WILL notice a drop in the lower range a BIT more than normal if you were to compare, but it should be less than an audible difference greater than 3dB. Simply put, with enough power, and the correct wiring (as 90 degrees is not a major change in phase at all) you will be fine, but do not expect it to outperform more efficient layouts or styles (ported, tapped, quasi, etc). The idea of isobaric in this situation is not a bad idea if running sealed. Mainly you will notice an increase in output from 2 drivers and not a notice in response curve cutoffs. So, they will "perform" quite similar to a dual 12 setup with double the volume, but with the ability to increase power handling and control from a smaller volume. In turn, that will flatten out the response more. The more compression you have at the listening area, the more smoothness in the curve will be noticable. For example, those with 6th and 4th order walls that get a great amount of passband range. That is due to the ratio of box volume to cabin volume being closer to a 1:1 than say a 2 cubic ft box in an suv. The more compression you have, the better the output and with power as a factor in relation to output, the more efficiency you will have AS LONG AS you have the power to run your setup efficiently. Hope that helps! [/QUOTE]
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Sealed box for 4 12's
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