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<blockquote data-quote="hispls" data-source="post: 8771750" data-attributes="member: 614752">Probably with a vehicle that long and if so you may wind up with a response curve that looks like a 2 humped camel if you tune your box lower.&nbsp;&nbsp; Have you checked out expected frequency response with those subs in your current box in some modelling software?&nbsp;&nbsp; That curve should help you see what gain you&#039;re getting from the box/port and what is cabin gain and help you to determine how far away or close together to keep box tuning from vehicle peak.&nbsp; Depending on the sub and box your peak may be a fair bit above tuning, this is mostly dependent on the sub&#039;s parameters.&nbsp; My build log mostly here, I have moved the Focal amp, swapped in the SFB amps and replaced most of my fronts since the last time I updated that but haven&#039;t really messed with anything in the box.&nbsp; Box is, near as I can figure, 24 cube, tuning is probably pretty close to my peak, but it is hard to determine how &quot;long&quot; a port like that is.<a href="https://www.caraudio.com/threads/bye-bye-back-seats.589759/page-4" target="_blank">https://www.caraudio.com/threads/bye-bye-back-seats.589759</a>Wood isn&#039;t getting any cheaper so you really should try brainstorming ways to be able to build with some sort of temporary port that you can tweak tuning and do some testing before making something permanent.&nbsp; &nbsp; building 16-20 cubic foot boxes and throwing them away is going to get old fast.</blockquote>

[QUOTE="hispls, post: 8771750, member: 614752"] Probably with a vehicle that long and if so you may wind up with a response curve that looks like a 2 humped camel if you tune your box lower. Have you checked out expected frequency response with those subs in your current box in some modelling software? That curve should help you see what gain you're getting from the box/port and what is cabin gain and help you to determine how far away or close together to keep box tuning from vehicle peak. Depending on the sub and box your peak may be a fair bit above tuning, this is mostly dependent on the sub's parameters. My build log mostly here, I have moved the Focal amp, swapped in the SFB amps and replaced most of my fronts since the last time I updated that but haven't really messed with anything in the box. Box is, near as I can figure, 24 cube, tuning is probably pretty close to my peak, but it is hard to determine how "long" a port like that is. [URL='https://www.caraudio.com/threads/bye-bye-back-seats.589759/page-4']https://www.caraudio.com/threads/bye-bye-back-seats.589759[/URL] Wood isn't getting any cheaper so you really should try brainstorming ways to be able to build with some sort of temporary port that you can tweak tuning and do some testing before making something permanent. building 16-20 cubic foot boxes and throwing them away is going to get old fast. [/QUOTE]

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