{"product_id":"professional-series-ported-12-enclosure-sundown-audio-x-series-v-3-12","title":"Professional Series Ported 12\" Enclosure | Sundown Audio X-Series v.3 12","description":"\u003cstyle\u003e.df-wrap{font-family:'Helvetica Neue',Arial,sans-serif;line-height:1.75;color:#d6d3d1;max-width:1100px;margin:0 auto;background:#0c0a09}.df-wrap *{box-sizing:border-box}.df-hero{background:linear-gradient(135deg,#0c0a09 0%,#001a91 100%);padding:54px 36px;text-align:center;color:#fff}.df-hero h2{font-size:2.3em;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px;color:#fff}.df-hero p{font-size:1.1em;font-weight:300;opacity:.93;margin:0 0 22px;color:#d6d3d1}.df-badges{display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.df-badge{background:rgba(91,120,255,.18);border:1px solid #5b78ff;color:#99abff;padding:7px 16px;border-radius:18px;font-size:.8em;font-weight:600}.df-stats{display:flex;flex-wrap:wrap;background:#1c1917}.df-stat{flex:1 1 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class=\"df-wrap\"\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n  \u003ch2\u003eProline X Professional 12\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported twelve-inch box built to Sundown's own numbers for the X-Series v.3 12\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e4.12 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 31.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 25.8 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003e2.25\" three-layer baffle\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eCut for the X-Series v.3 12\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eBuilt in Tennessee\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-stats\"\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e4.12\u003c\/span\u003e\u003cspan class=\"l\"\u003ecu ft net\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e31.0\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz tuning\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e25.8\u003c\/span\u003e\u003cspan class=\"l\"\u003eHz F3 anechoic\u003c\/span\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"df-stat\"\u003e\n\u003cspan class=\"n\"\u003e72.5\u003c\/span\u003e\u003cspan class=\"l\"\u003esq in port area\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhy this driver is vented at 31.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThe Sundown Audio X-Series v.3 12 D2 carries a 12.68 inch frame and a 9.67 inch mounting depth, and this cabinet gives it 4.121 cubic feet net, vented at 31.0 Hz through a 72.5 square inch port beside the woofer on the front face. F3 lands at 25.8 Hz with 5.97 dB of passband ripple. The 32.0 by 16.0 by 27.5 inch enclosure carries a single 90 degree bend in the port, and the D1 version of this driver shares the same cabinet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThreaded insert kit ships with this box.\u003c\/strong\u003e Sundown Audio does not publish the mounting hole locations for the X-Series v.3 12, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.\u003c\/p\u003e\n  \u003cp\u003eSundown publishes a Qts of 0.490 for the X-Series v.3 12 D2, and the figure checks out against their own Qes of 0.540 and Qms of 4.820. Sundown does not recommend this driver sealed; their own ported figure is 2.50 cubic feet at 32 Hz through a 40 square inch port, and they say it runs in up to a 50 percent larger box. This cabinet is larger, because the gate here is measured at the coil's rated power, 2500 W, and keeping the slot mouth under 17 metres per second at that power takes 72.5 square inches of port, which is what sets the 27.5 inch depth; in Sundown's 2.50 cubic feet no port that fits can hold that velocity. The port stays clean to 2514 W before mouth velocity becomes the limiting factor, the cone peaks at 16.7 of its 30.0 mm at rated power, and ripple across the passband holds at 5.97 dB.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eWhat makes it Professional\u003c\/h3\u003e\n  \u003cdiv class=\"df-grid\"\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThree-layer baffle, flush mount\u003c\/h4\u003e\n\u003cp\u003eThree layers of 3\/4 inch Langboard Elite make a 2.25 inch\n    front. The outer layer is routed to the flange, so the woofer sits flush with the face; the two layers behind it\n    carry the mounting hardware and the load.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eSundown Audio logo acrylic\u003c\/h4\u003e\n\u003cp\u003eA glossy black acrylic insert with the Sundown Audio mark sits in the outer\n    layer beside the woofer. It is standard on every Professional cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eThreaded insert kit ships with this box\u003c\/h4\u003e\n\u003cp\u003eThreaded insert kit included, inserts NOT pre-installed: the manufacturer publishes no mounting hole locations, so the kit ships with the box for installation when the woofer goes in: 8 to 12 inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, allen key and gasket tape.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003ePort gated at 2500 W\u003c\/h4\u003e\n\u003cp\u003eThe 72.5 square inch slot beside the woofer is sized so the\n    channel runs 21.7 metres per second and the mouth 17.0 metres per second at the driver's rated power, under the\n    17 metres per second where a slot starts to chuff. The channel runs 18.75 inches along its wall and turns once along the back wall for another 8.86 inches, which is why a 31.0 Hz tuning fits a 27.50 inch deep box.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhy this is a Professional build\u003c\/h4\u003e\n\u003cp\u003eEvery driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The X-Series v.3 12 did not clear the port gate there. The calmest wedge port that fits that envelope is 19.9 square inches at 23.5 by 12.12 by 17.77 inches, and its mouth runs 34.7 metres per second at 2500 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 599 W. The slot on this box reaches 72.5 square inches and holds the mouth at 17.0 metres per second at 2500 W.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eThis cabinet is 8.15 cubic feet outside. Delivery to the 48 states is inside the price; it ships as an 88 lb parcel and checkout adds nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat Sundown Audio recommend\u003c\/h4\u003e\n\u003cp\u003eSundown Audio publish a vented box for the X-Series v.3 12 at 2.50 cubic feet on a basis they do not state, tuned to 32.0 Hz. This cabinet holds 4.12 cubic feet net and tunes to 31.0 Hz. They call for a port area of 40 sq in. The extra air lowers the low corner rather than raising output at tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe cabinet\u003c\/h3\u003e\n  \u003cp\u003e32.00\" W x 16.00\" H x 27.50\" D external. Two windowed braces run front to back either side of the woofer, clearing the cutout by two and a half inches. The box ships dry: polyfill detunes a ported alignment. This is our single-twelve ported envelope built around the X-Series v.3 12's own frame and motor depth. It ships as a parcel.\u003c\/p\u003e\n  \u003cp\u003eFrame, cutout and mounting depth are Sundown's own published dimensions, and the Qts figure agrees with what its own Qes and Qms predict. Sundown prints the cone area as the nominal disc, so the 462 square centimetre figure behind this alignment is derived from their Vas and Cms instead. They list 30 mm of Xmax without stating how it was measured; their copy quotes four inches of peak to peak travel, so the figure reads as one-way linear, and at rated power the cone uses 16.7 mm of it. The slot mouth runs 17.0 metres per second at 2500 W against the 17 metre per second point where a slot starts to chuff. The D1 coil shares the same basket and fits this same cabinet without a dimensional change. Sundown Audio does not publish the mounting hole locations for the X-Series v.3 12, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n  \u003ch3\u003eThe numbers to respect\u003c\/h3\u003e\n  \n  \u003cp\u003eSet a 24 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 16.7 mm of its 30.0 mm at 2500 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47760236576857,"sku":"Pro 12-P X12","price":799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/Pro_12-P_X12_Front.jpg?v=1794014037","url":"https:\/\/audiointensity.com\/products\/professional-series-ported-12-enclosure-sundown-audio-x-series-v-3-12","provider":"Audio Intensity","version":"1.0","type":"link"}