{"product_id":"professional-series-ported-15-enclosure-sundown-audio-x-series-xv4-15","title":"Professional Series Ported 15\" Enclosure | Sundown Audio X-Series XV4 15","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 15\" Ported\u003c\/h2\u003e\n  \u003cp\u003eA ported fifteen-inch box built to Sundown's own numbers for the X-Series XV4 15\u003c\/p\u003e\n  \u003cdiv class=\"df-badges\"\u003e\n    \u003cspan class=\"df-badge\"\u003e4.27 cu ft net\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eTuned 32.0 Hz\u003c\/span\u003e\n    \u003cspan class=\"df-badge\"\u003eF3 26.4 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 XV4 15\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\"\u003e4.27\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\"\u003e32.0\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\"\u003e26.4\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\"\u003e82.5\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 32.0 Hz\u003c\/h3\u003e\n  \u003cp\u003eThe Sundown Audio X-Series XV4 15 D2 carries a 15.51 inch frame and a 12.95 inch mounting depth, and this cabinet gives it 4.265 cubic feet net, vented at 32.0 Hz through an 82.5 square inch port beside the woofer on the front face. F3 lands at 26.4 Hz with 5.19 dB of passband ripple. The 33.5 by 18.0 by 25.0 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 XV4 15, 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 0.440 for the X-Series XV4 15 D2, and the figure checks out against their own Qes of 0.490 and Qms of 4.080. Sundown does not recommend this driver sealed; their own ported figure is 4.25 cubic feet at 32 Hz through a 68 square inch port. This cabinet is built to that figure: 4.27 cubic feet net, tuned to 32.0 Hz. The one place it departs from Sundown's sheet is the port, 82.5 square inches against their 68, because at the coil's rated power, 2750 W, a 68 square inch slot would put the mouth over 17 metres per second. The port stays clean to 2751 W before mouth velocity becomes the limiting factor, the cone peaks at 13.8 of its 30.0 mm at rated power, and ripple across the passband holds at 5.19 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 2750 W\u003c\/h4\u003e\n\u003cp\u003eThe 82.5 square inch slot beside the woofer is sized so the\n    channel runs 21.6 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 16.25 inches along its wall and turns once along the back wall for another 12.36 inches, which is why a 32.0 Hz tuning fits a 25.00 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 XV4 15 does not fit that envelope at all: no tuning, width or depth inside it carries a 12.95 inch deep 15 inch driver at 2750 W. This box is the chassis with the width, depth and port to carry it.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"df-card\"\u003e\n\u003ch4\u003eWhat the price covers\u003c\/h4\u003e\n\u003cp\u003eEvery Professional cabinet is priced the same way, by its size: this one is 8.72 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 90 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 XV4 15 at 4.25 cubic feet on a basis they do not state, tuned to 32.0 Hz. This cabinet holds 4.27 cubic feet net and tunes to 32.0 Hz. They call for a port area of 68 sq in.\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\u003e33.50\" W x 18.00\" H x 25.00\" 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-fifteen ported envelope built around the X-Series XV4 15'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 734 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, and at rated power the cone uses 13.8 mm of it. The slot mouth runs 17.0 metres per second at 2750 W against the 17 metre per second point where a slot starts to chuff. The page's D1 column repeats the X-Series v.3 15's table, so this cabinet is solved on the D2 column, which is the XV4's own measurement; the D1 coil shares the same basket and fits the same cabinet. Sundown's page carries two power figures, 3000 W in the title and 2750 W in the spec table; this cabinet is designed against the lower one, which their notice on revised ratings makes the current figure. Sundown Audio does not publish the mounting hole locations for the X-Series XV4 15, 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 25 Hz subsonic filter, 24 dB per octave. Below tuning the vent stops loading the cone; with the filter in\n  place the cone reaches 13.8 mm of its 30.0 mm at 2750 W.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":47760281927769,"sku":"Pro 15-P XV415","price":899.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/Pro_15-P_XV415_Front.jpg?v=1794017364","url":"https:\/\/audiointensity.com\/products\/professional-series-ported-15-enclosure-sundown-audio-x-series-xv4-15","provider":"Audio Intensity","version":"1.0","type":"link"}