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<blockquote data-quote="helotaxi" data-source="post: 1479436" data-attributes="member: 550915">They may be suitable for &quot;free-air&quot; but what you think of as &quot;free-air&quot; and what Kicker was thinking of when they say &quot;free-air&quot; are two completely different things.&nbsp; When kicker is saying &quot;free-air&quot; they are talking about an infinite baffle.&nbsp; The front and rear wave of the sub must be completely isolated from each other.&nbsp; Basically free air is a sealed box large enough that the air inside the box provides no damping on the suspension of the sub.&nbsp; From an efficiency standpoint, free air subs are great.&nbsp; The speaker is not fighting the air in the box and will reach its maximum excursion with relatively little power, but since the air in the box is not providing any damping, the mechanical power handling is greatly reduced.&nbsp; It becomes very easy to exceed the max excursion capability of the sub and blow them from over-excursion.&nbsp; Since you have to isolate the front and rear waves of the sub for them to produce output, the only way to do an IB setup in a truck is by cutting sheetmetal.&nbsp; You would need to cut out the rear of the cab and the front of the bed, seal the gap between them in the cutout area, and mount the subs on a baffle in the cutout.&nbsp; You would really want a cover of some sort over the bed to protect the subs from the elements and you would need some kind of physical protection for them to keep items in the bed from damaging them.&nbsp; If you&#039;re going to that kind of trouble, you are basically better off doing the cutout and putting the subs in and appropriately sized enclosure in the bed firing through the cutout.What you are describing is only marginally better than just setting the subs behind the seat without a baffle or anything.&nbsp; The front and rear pressure waves of the subs are not isolated and cancellation will be almost total.&nbsp; The result will be no usable sub output and a high chance of blowing the subs from over-excursion.&nbsp; Your best bet with ther space you have is to run a single sub in the correct enclosure.&nbsp; It will almost assuredly outperform 2 subs with way to small and enclosure and will flat destroy what you are proposing.</blockquote>

[QUOTE="helotaxi, post: 1479436, member: 550915"] They may be suitable for "free-air" but what you think of as "free-air" and what Kicker was thinking of when they say "free-air" are two completely different things. When kicker is saying "free-air" they are talking about an infinite baffle. The front and rear wave of the sub must be completely isolated from each other. Basically free air is a sealed box large enough that the air inside the box provides no damping on the suspension of the sub. From an efficiency standpoint, free air subs are great. The speaker is not fighting the air in the box and will reach its maximum excursion with relatively little power, but since the air in the box is not providing any damping, the mechanical power handling is greatly reduced. It becomes very easy to exceed the max excursion capability of the sub and blow them from over-excursion. Since you have to isolate the front and rear waves of the sub for them to produce output, the only way to do an IB setup in a truck is by cutting sheetmetal. You would need to cut out the rear of the cab and the front of the bed, seal the gap between them in the cutout area, and mount the subs on a baffle in the cutout. You would really want a cover of some sort over the bed to protect the subs from the elements and you would need some kind of physical protection for them to keep items in the bed from damaging them. If you're going to that kind of trouble, you are basically better off doing the cutout and putting the subs in and appropriately sized enclosure in the bed firing through the cutout. What you are describing is only marginally better than just setting the subs behind the seat without a baffle or anything. The front and rear pressure waves of the subs are not isolated and cancellation will be almost total. The result will be no usable sub output and a high chance of blowing the subs from over-excursion. Your best bet with ther space you have is to run a single sub in the correct enclosure. It will almost assuredly outperform 2 subs with way to small and enclosure and will flat destroy what you are proposing. [/QUOTE]

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