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<blockquote data-quote="Buck" data-source="post: 8886766" data-attributes="member: 591582">Just to say this, if you&#039;re really at 2.5 at 35 Hz you should be able to hit 70.&nbsp; It really shouldn&#039;t fall off too terribly hard unless there&#039;s something else going on.&nbsp; Port area does play into this, as well.&nbsp; I&#039;ve designed for a lot of different kickers and actually built and installed a decent bit for kickers over time.&nbsp; I found they work in a lot of different box sizes, but 2.5 cubes shouldn&#039;t fall off too hard, especially if the FS of the&nbsp; sub is&nbsp; 40 Hz.&nbsp; It&#039;s so hard to tell without being there, though.Do you know what your voltage drops are at different frequencies of base notes you&#039;re playing?Is the divider between the rear seat in the trunk solid or is there any gaps for air to come through?&nbsp; What about the rear deck?&nbsp; There are instances when cars literally don&#039;t have enough airflow in between the trunk and cabin, and there are some cars that have sound cancellation built into the structure of the car where it makes the bass in the trunk cancel out.&nbsp; It&#039;s a can of worms when you really get into designing.&nbsp; It&#039;s just hard for me to tell from here, it&#039;s a list, a process you have to go through to make it the best.I would try to fire everything backwards if you could, but it depends on how much space is in between the outside of the box walls and the inner trunk walls, you have to make sure there&#039;s enough area around the box for the air to move into the cabin out of the port and subs.&nbsp; Just some things for you to think about.</blockquote>

[QUOTE="Buck, post: 8886766, member: 591582"] Just to say this, if you're really at 2.5 at 35 Hz you should be able to hit 70. It really shouldn't fall off too terribly hard unless there's something else going on. Port area does play into this, as well. I've designed for a lot of different kickers and actually built and installed a decent bit for kickers over time. I found they work in a lot of different box sizes, but 2.5 cubes shouldn't fall off too hard, especially if the FS of the sub is 40 Hz. It's so hard to tell without being there, though. Do you know what your voltage drops are at different frequencies of base notes you're playing? Is the divider between the rear seat in the trunk solid or is there any gaps for air to come through? What about the rear deck? There are instances when cars literally don't have enough airflow in between the trunk and cabin, and there are some cars that have sound cancellation built into the structure of the car where it makes the bass in the trunk cancel out. It's a can of worms when you really get into designing. It's just hard for me to tell from here, it's a list, a process you have to go through to make it the best. I would try to fire everything backwards if you could, but it depends on how much space is in between the outside of the box walls and the inner trunk walls, you have to make sure there's enough area around the box for the air to move into the cabin out of the port and subs. Just some things for you to think about. [/QUOTE]

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