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2008 GMC Sierra build for four 8" subs in fiberglass ported box with 3" seat raise
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<blockquote data-quote="Trancer" data-source="post: 7686830" data-attributes="member: 544448"><p>Thank you for the compliment.</p><p></p><p>The box will be fiberglassed on the bottom and the rear lip.</p><p></p><p>I got my idea and I am using this thread as a reference. His truck is an OBS 2001 Extended cab.</p><p></p><p><a href="http:////forums/car-audio-build-logs-cars-trucks-suvs/461637-4-10-s-under-rear-seat-silverado-ext-cab.html" target="_blank">http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/461637-4-10-s-under-rear-seat-silverado-ext-cab.html</a></p><p></p><p>He was able to get over 5 cubic feet of airspace after displacement in his ported box and ran 4 RE SE 10's. I use to run two RE SE 12's in a sealed Subthump box with .83 cu ft before driver displacement so I wasn't using them to their full advantage. They were wanting more airspace. If I could run four RE SE 10's, I would. The OBS trucks, even the extended cab trucks, have more room under there than the NBS Crew Cab trucks unfortunately, so I wont be able to get 5.9 cu ft of airspace before port and sub displacement and just a tad over 5 cu ft after displacement like he was able to do.He tuned it to 32hz, so he had quite a bit of port displacement. About .75 cu ft of port displacement with 3 4" aero ports. He did a 4" seat raise. I did a 3" seat raise. Hopefully this wont bite me in the rear, but I didnt want to raise my seats that high. I plan on doing one precision port on firing one at the passenger door and one at the drivers side door. So even though I will be going with 2hz lower, which will make my port a bit longer, I wont be doing 3 ports, I'll be doing 2, so that should help me out with not having so much port displacement.</p></blockquote><p></p>
[QUOTE="Trancer, post: 7686830, member: 544448"] Thank you for the compliment. The box will be fiberglassed on the bottom and the rear lip. I got my idea and I am using this thread as a reference. His truck is an OBS 2001 Extended cab. [URL="http:////forums/car-audio-build-logs-cars-trucks-suvs/461637-4-10-s-under-rear-seat-silverado-ext-cab.html"]http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/461637-4-10-s-under-rear-seat-silverado-ext-cab.html[/URL] He was able to get over 5 cubic feet of airspace after displacement in his ported box and ran 4 RE SE 10's. I use to run two RE SE 12's in a sealed Subthump box with .83 cu ft before driver displacement so I wasn't using them to their full advantage. They were wanting more airspace. If I could run four RE SE 10's, I would. The OBS trucks, even the extended cab trucks, have more room under there than the NBS Crew Cab trucks unfortunately, so I wont be able to get 5.9 cu ft of airspace before port and sub displacement and just a tad over 5 cu ft after displacement like he was able to do.He tuned it to 32hz, so he had quite a bit of port displacement. About .75 cu ft of port displacement with 3 4" aero ports. He did a 4" seat raise. I did a 3" seat raise. Hopefully this wont bite me in the rear, but I didnt want to raise my seats that high. I plan on doing one precision port on firing one at the passenger door and one at the drivers side door. So even though I will be going with 2hz lower, which will make my port a bit longer, I wont be doing 3 ports, I'll be doing 2, so that should help me out with not having so much port displacement. [/QUOTE]
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2008 GMC Sierra build for four 8" subs in fiberglass ported box with 3" seat raise
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