{"product_id":"u-series-v-2-18-subwoofer","title":"U-Series v.2 18\" Subwoofer","description":"\u003cul\u003e\n\u003cli class=\"MsoNormal\" style=\"line-height: normal; text-align: left;\"\u003eRMS 1750 watts\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"line-height: normal; text-align: left;\"\u003eDual 2 or 4 ohm voice coils\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eOptimized for small ported or bandpass enclosures\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eAluminum 3” voice coil former for superior heat dissipation\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eHigh-temperature copper voice coil\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eDouble stitched surround\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eHeavy-duty cast basket\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eSpring-loaded terminals accept up to 8-gauge wire\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eStitched-on heavy-duty tinsel leads\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eSolid pole with vent channels and aluminum shorting ring cap\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eRear gap-venting\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"text-align: left;\"\u003eTop-Plate Cooling Channels\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDesigned to be at home in the competition lanes or playing your favorite music, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9.4-inch wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. A custom aluminum frame was designed specifically for the U Series. It’s substantially thicker and equipped with heat dissipation ribs at the bottom of the frame. The U v.2 motor also features an extended pole piece to keep the coil under perfect control under high stress. The coil temperature is controlled with machined, high-velocity pole channels and a series of 16 direct air-gap vents in the back plate.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"cus-flex\"\u003e\n\u003cdiv class=\"box-2\"\u003e\n\u003ch3 class=\"el-title uk-text-danger uk-margin-top uk-margin-remove-bottom\"\u003eSpecifications\u003cbr\u003e\n\u003c\/h3\u003e\n\u003ctable class=\"uk-table uk-table-striped uk-table-small\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRE (Ohms)\u003c\/td\u003e\n\u003ctd\u003e3.8710\u003c\/td\u003e\n\u003ctd\u003e6.0767\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS (Hz)\u003c\/td\u003e\n\u003ctd\u003e30.9541\u003c\/td\u003e\n\u003ctd\u003e30.9212\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVAS (L)\u003c\/td\u003e\n\u003ctd\u003e111.7625\u003c\/td\u003e\n\u003ctd\u003e114.6901\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQes\u003c\/td\u003e\n\u003ctd\u003e0.5669\u003c\/td\u003e\n\u003ctd\u003e0.6572\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQms\u003c\/td\u003e\n\u003ctd\u003e5.6396\u003c\/td\u003e\n\u003ctd\u003e5.5116\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQts\u003c\/td\u003e\n\u003ctd\u003e0.5151\u003c\/td\u003e\n\u003ctd\u003e0.5872\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLe (mH)\u003c\/td\u003e\n\u003ctd\u003e3.3981\u003c\/td\u003e\n\u003ctd\u003e4.7475\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBL (NA)\u003c\/td\u003e\n\u003ctd\u003e27.4023\u003c\/td\u003e\n\u003ctd\u003e31.4938\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMms (Grams)\u003c\/td\u003e\n\u003ctd\u003e565.4130\u003c\/td\u003e\n\u003ctd\u003e552.1551\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCms (uM\/N)\u003c\/td\u003e\n\u003ctd\u003e46.7560\u003c\/td\u003e\n\u003ctd\u003e47.9807\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSens (dB @ 1w\/1m)\u003c\/td\u003e\n\u003ctd\u003e89.4169\u003c\/td\u003e\n\u003ctd\u003e88.8733\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eXmax\u003c\/td\u003e\n\u003ctd\u003e30mm\u003c\/td\u003e\n\u003ctd\u003e30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth class=\"uk-text-nowrap\"\u003eT\/S SPECS\u003c\/th\u003e\n\u003cth class=\"uk-text-nowrap\"\u003e\u003cstrong\u003eUV.2 18\" D2\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth class=\"uk-text-nowrap\"\u003e\u003cstrong\u003eUV.2 18\" D4\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"box-3\"\u003e\n\u003ch3 class=\"el-title uk-text-danger uk-margin-top uk-margin-remove-bottom\"\u003eEnclosure Specifications\u003cbr\u003e\n\u003c\/h3\u003e\n\u003ctable class=\"uk-table uk-table-striped uk-table-small\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSealed Enclosure\u003c\/td\u003e\n\u003ctd\u003e3.0 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorted Enclosure\u003c\/td\u003e\n\u003ctd\u003e4.0 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Tuning\u003c\/td\u003e\n\u003ctd\u003e35Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Port Area\u003c\/td\u003e\n\u003ctd\u003e64 sq in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplacement\u003c\/td\u003e\n\u003ctd\u003e0.26 cu ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDepth\u003c\/td\u003e\n\u003ctd\u003e10″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside Diameter\u003c\/td\u003e\n\u003ctd\u003e18.63″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-Out\u003c\/td\u003e\n\u003ctd\u003e16.9″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Dimensions\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0770\/6669\/9062\/files\/U18.pdf?v=1688795507\" target=\"_blank\"\u003eDownload\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Linear Audio UK","offers":[{"title":"D2","offer_id":57657761759606,"sku":null,"price":719.99,"currency_code":"GBP","in_stock":true},{"title":"D4","offer_id":57657761792374,"sku":null,"price":719.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0291\/9664\/8482\/files\/Uv2-18-000-e567c11d.webp?v=1775952730","url":"https:\/\/www.d2ualternators.com\/products\/u-series-v-2-18-subwoofer","provider":"D2U Alternators","version":"1.0","type":"link"}