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<blockquote data-quote="keep_hope_alive" data-source="post: 7912220" data-attributes="member: 576029"><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/AccordTweeters005.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_finish027.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordIBwall038.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_fg005-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />no great stuff foam for me.sealed off prevents phase interference from sound bouncing around in the trunk and arriving later.&nbsp; the extra output some trunks get is from constructive interference at a few frequencies (usually in the 40-60Hz range).&nbsp; but that means you also have cancellation at other frequencies.&nbsp; it is somewhat vehicle dependent since it relates to geometry.&nbsp; and it depends on the enclosure as well.&nbsp; sound off the rear of the sub will reflect off the rear box wall and come back out the cone.&nbsp; this plagues all speaker systems.&nbsp; controlling it is hard.&nbsp; it&#039;s why i gain output by opening my trunk.&nbsp; i eliminate the destructive reflections that come back through my woofer cones.</blockquote>

[QUOTE="keep_hope_alive, post: 7912220, member: 576029"] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/AccordTweeters005.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_finish027.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordIBwall038.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/Accord%202009/0610trunkIBwall/accordtrunk_IBwall_fg005-1.jpg[/IMG] no great stuff foam for me. sealed off prevents phase interference from sound bouncing around in the trunk and arriving later. the extra output some trunks get is from constructive interference at a few frequencies (usually in the 40-60Hz range). but that means you also have cancellation at other frequencies. it is somewhat vehicle dependent since it relates to geometry. and it depends on the enclosure as well. sound off the rear of the sub will reflect off the rear box wall and come back out the cone. this plagues all speaker systems. controlling it is hard. it's why i gain output by opening my trunk. i eliminate the destructive reflections that come back through my woofer cones. [/QUOTE]

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