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<blockquote data-quote="thch" data-source="post: 1974423" data-attributes="member: 562032">speakers are measured on a baffle to get the free air measurements.putting them in a box changes the specs somewhat.a normal sealed box changes these to something more desirable.how much a box affects things is based loosely on size -- making a box larger then a certain size only affects the specs of the woofer slightly.IB woofers are made to work well in any box larger then this size -- thus an 8&quot; IB woofer might be designed to work in a 2ft^3 sealed box or larger and still be called an IB woofer.&nbsp; basically for a large enough box, the specs are the same as the free-air specs.best results are obtained by isolating the front wave from the rear wave.&nbsp; eg, placing an airtight wood/fiberglass barrier on the trunk/rear deck -- basically making the entire trunk into an airtight box.&nbsp; failure to do this will allow some of the rear wave to cancel the front wave.&nbsp; if the rearwave is naturally attenuated by 10dB or more, it may be fine just to let it be as the rearwave will not significantly affect the front wavenot all IB woofers are applicable.&nbsp; for instance some home audio IB woofers are made for boxes larger then a car.&nbsp; their intended use -- a room or attic -- is large enough to be concidered IB, but a car&#039;s trunk would be incredibly small.&nbsp; so stick with IB woofers designed for car audio!</blockquote>

[QUOTE="thch, post: 1974423, member: 562032"] speakers are measured on a baffle to get the free air measurements. putting them in a box changes the specs somewhat. a normal sealed box changes these to something more desirable. how much a box affects things is based loosely on size -- making a box larger then a certain size only affects the specs of the woofer slightly. IB woofers are made to work well in any box larger then this size -- thus an 8" IB woofer might be designed to work in a 2ft^3 sealed box or larger and still be called an IB woofer. basically for a large enough box, the specs are the same as the free-air specs. best results are obtained by isolating the front wave from the rear wave. eg, placing an airtight wood/fiberglass barrier on the trunk/rear deck -- basically making the entire trunk into an airtight box. failure to do this will allow some of the rear wave to cancel the front wave. if the rearwave is naturally attenuated by 10dB or more, it may be fine just to let it be as the rearwave will not significantly affect the front wave not all IB woofers are applicable. for instance some home audio IB woofers are made for boxes larger then a car. their intended use -- a room or attic -- is large enough to be concidered IB, but a car's trunk would be incredibly small. so stick with IB woofers designed for car audio! [/QUOTE]

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