{"product_id":"tru-spec-prefab-quad-8-subwoofer-enclosure-subs-up-port-back","title":"TRU SPEC Prefab Quad 8\" Subwoofer Enclosure Subs Up Port Back","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003ePlan a four-subwoofer installation with the Tru Spec quad 8-inch ported enclosure. The subs-up, port-back layout combines four 7.45-inch cutouts with a flush baffle and a published total net volume of 3.50 ft³.\u003c\/p\u003e\u003cp\u003eThis is an empty enclosure only. No subwoofer is included.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFlush baffle.\u003c\/li\u003e\n\u003cli\u003eSub-up, port-back layout provides a defined orientation for planning driver and port clearance.\u003c\/li\u003e\n\u003cli\u003e0.75-inch MDF construction, with the enclosure dimensions and acoustic specifications listed below for comparison.\u003c\/li\u003e\n\u003cli\u003eEmpty enclosure lets you select the subwoofers separately; no subwoofer is included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEnclosure type\u003c\/th\u003e\n\u003ctd\u003ePorted; empty enclosure only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSubwoofer configuration\u003c\/th\u003e\n\u003ctd\u003e4 x 8-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eExternal dimensions (W x H x D)\u003c\/th\u003e\n\u003ctd\u003e34.00 inches x 14.00 inches x 22.00 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eMDF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMaterial thickness\u003c\/th\u003e\n\u003ctd\u003e0.75 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTotal net internal volume\u003c\/th\u003e\n\u003ctd\u003e3.50 ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTuning frequency\u003c\/th\u003e\n\u003ctd\u003e35 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePort area\u003c\/th\u003e\n\u003ctd\u003e52.00 in²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCutout diameter\u003c\/th\u003e\n\u003ctd\u003e7.45 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFlush trim diameter\u003c\/th\u003e\n\u003ctd\u003e9 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBaffle and reinforcement\u003c\/th\u003e\n\u003ctd\u003eFlush baffle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eLayout\u003c\/th\u003e\n\u003ctd\u003eSubwoofer(s) up; port back\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTotal driver-displacement allowance\u003c\/th\u003e\n\u003ctd\u003e0.24 ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDriver-displacement allowance per subwoofer\u003c\/th\u003e\n\u003ctd\u003e0.06 ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\n\u003cp\u003eThis enclosure gives a quad 8-inch project a defined footprint, tuning frequency and port area without designing the box from scratch. The supplier lists several compatible driver families, but the final choice still needs to match the cutout, clearance and airspace requirements.\u003c\/p\u003e\n\u003ch2\u003eInstallation \u0026amp; Compatibility Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSupplier-listed alternatives: Deaf Bonce Machete MF 8-inch, DC Audio M3 8-inch, CT Sounds Meso 8-inch, Skar VD 8-inch, Skar SDR 8-inch, Skar SVR 8-inch, Skar EVL 8-inch, DS-18 Elite Z 8-inch.\u003c\/li\u003e\n\u003cli\u003eThe quoted net volume uses the supplier's 0.24 ft³ total driver-displacement allowance. A different driver displacement changes the final available airspace.\u003c\/li\u003e\n\u003cli\u003eThe supplier describes typical 8-inch driver displacement as 0.05–0.06 ft³ per driver; use the actual displacement of your chosen subwoofers.\u003c\/li\u003e\n\u003cli\u003eMeasure the intended vehicle space and its access opening. Check basket and motor clearance, mounting depth, terminals and cone clearance against the actual driver. No vehicle-specific fitment is claimed.\u003c\/li\u003e\n\u003cli\u003eA maximum mounting-depth measurement is not provided in the supplier description. Confirm clearance for your exact subwoofer before purchase.\u003c\/li\u003e\n\u003cli\u003eLeave the port opening unobstructed and confirm the driver manufacturer's recommended ported volume and tuning. Secure the enclosure appropriately for the vehicle installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eAre subwoofers included?\u003c\/h3\u003e\u003cp\u003eNo. This listing is for an empty ported enclosure only. The 4 compatible 8-inch subwoofers are selected and purchased separately.\u003c\/p\u003e\u003ch3\u003eDoes matching the nominal subwoofer size guarantee compatibility?\u003c\/h3\u003e\u003cp\u003eNo. Confirm the exact model, cutout, mounting depth, basket clearance, displacement and recommended enclosure volume. A 8-inch size label alone is not enough to establish fit.\u003c\/p\u003e\u003ch3\u003eWhich direction do the subwoofers and port face?\u003c\/h3\u003e\u003cp\u003eThe driver mounting positions face upward and the port faces the back. Check clearance above the subwoofers and around the port in the planned installation.\u003c\/p\u003e\n\u003ch2\u003eExplore More\u003c\/h2\u003e\n\u003cp\u003eCompare more options in our \u003ca href=\"https:\/\/12voltoutlet.com\/collections\/tru-spec-enclosures\"\u003eTru Spec enclosures collection\u003c\/a\u003e, or \u003ca href=\"https:\/\/12voltoutlet.com\/pages\/contact\"\u003econtact 12 Volt Outlet\u003c\/a\u003e with your subwoofer model and available installation space for help checking this enclosure.\u003c\/p\u003e\n","brand":"GP Car Audio","offers":[{"title":"Default Title","offer_id":67769726566628,"sku":"1541YTM","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/2522\/9028\/files\/165516273805740114__64039.jpg?v=1792707837","url":"https:\/\/www.12voltoutlet.com\/products\/tru-spec-prefab-quad-8-subwoofer-enclosure-subs-up-port-back","provider":"12 Volt Outlet","version":"1.0","type":"link"}