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<blockquote data-quote="T3mpest" data-source="post: 8212396" data-attributes="member: 560148">Not sure if anyone makes those anymore.&nbsp; I believe Exodus audio did for a short while, or it was in the plans and never happened, IDK.&nbsp; Since he&#039;s only running OA18&#039;s he &quot;may&quot; be able to get by with 2 18inch passives.&nbsp; Most passives won&#039;t have double the throw of the woofer, closer to 75% more.&nbsp; He could get by with 3 though if he side fires one.&nbsp; I have a setup like this right now and it has NO loading issues whatsoever, it&#039;s actually too loud at tuning if anything. I have 2 facing rear and one on the passenger side.. You def have to get the box secured to the vehicle though.&nbsp; I had a box that&#039;s a sheet and half of mdf with a 60lb sub on top and it still moves around the car when the bass hits.. Tuned at 30hz does really well down to 20hz.Anyway as buck said, if your going to do port up I&#039;d run it along the back so it&#039;s still getting as much loading as possible off the rear.</blockquote>

[QUOTE="T3mpest, post: 8212396, member: 560148"] Not sure if anyone makes those anymore. I believe Exodus audio did for a short while, or it was in the plans and never happened, IDK. Since he's only running OA18's he "may" be able to get by with 2 18inch passives. Most passives won't have double the throw of the woofer, closer to 75% more. He could get by with 3 though if he side fires one. I have a setup like this right now and it has NO loading issues whatsoever, it's actually too loud at tuning if anything. I have 2 facing rear and one on the passenger side.. You def have to get the box secured to the vehicle though. I had a box that's a sheet and half of mdf with a 60lb sub on top and it still moves around the car when the bass hits.. Tuned at 30hz does really well down to 20hz. Anyway as buck said, if your going to do port up I'd run it along the back so it's still getting as much loading as possible off the rear. [/QUOTE]

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