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<blockquote data-quote="MiniVanMan" data-source="post: 2789124" data-attributes="member: 573252">Oh, and you can never truly seal a door.&nbsp; You basically cover all the holes as best you can, just to add a little back pressure for the speaker.&nbsp; The tighter the seal, the tighter the bass.I&#039;m not sure what your installer means by &quot;sealing the back of the driver&quot;.&nbsp; That kind of scares me.&nbsp; Without sufficient air, the driver will be choked, and you&#039;ll defeat the strength of the L15, and that&#039;s it&#039;s midbass response.I&#039;ve put together some response graphs to illustrate my concern.The first graph is the response of the driver with a 0.16 ^ft enclosure.&nbsp; F3 of about 90 hz.&nbsp; Nice flat response.&nbsp; Any peaking will be due to cabin gain, but should be realized lower than 100 hz.<img src="http://img.photobucket.com/albums/v641/glevii/L15-2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The next graph is with a .05 ^ft enlosure.&nbsp; This would require a tube of 5.5&quot; wide, by 5&quot; long (taking into account driver displacement).&nbsp; Still not a horrible response.&nbsp; Would be a bit boomy at 150 hz, and if there&#039;s any resonance on your door panel this is probably where it will be realized.&nbsp; This could be bad, or it could be okay.<img src="http://img.photobucket.com/albums/v641/glevii/L15-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The next, and final one is if the driver is just sealed up in the back.&nbsp; This is a 5.5&quot; tube at 2.75&quot; long.&nbsp; Not at all a desirable effect.<img src="http://img.photobucket.com/albums/v641/glevii/L15.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="MiniVanMan, post: 2789124, member: 573252"] Oh, and you can never truly seal a door. You basically cover all the holes as best you can, just to add a little back pressure for the speaker. The tighter the seal, the tighter the bass. I'm not sure what your installer means by "sealing the back of the driver". That kind of scares me. Without sufficient air, the driver will be choked, and you'll defeat the strength of the L15, and that's it's midbass response. I've put together some response graphs to illustrate my concern. The first graph is the response of the driver with a 0.16 ^ft enclosure. F3 of about 90 hz. Nice flat response. Any peaking will be due to cabin gain, but should be realized lower than 100 hz. [IMG]http://img.photobucket.com/albums/v641/glevii/L15-2.jpg[/IMG] The next graph is with a .05 ^ft enlosure. This would require a tube of 5.5" wide, by 5" long (taking into account driver displacement). Still not a horrible response. Would be a bit boomy at 150 hz, and if there's any resonance on your door panel this is probably where it will be realized. This could be bad, or it could be okay. [IMG]http://img.photobucket.com/albums/v641/glevii/L15-1.jpg[/IMG] The next, and final one is if the driver is just sealed up in the back. This is a 5.5" tube at 2.75" long. Not at all a desirable effect. [IMG]http://img.photobucket.com/albums/v641/glevii/L15.jpg[/IMG] [/QUOTE]

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