{"product_id":"proline-x-p12-s-df-single-12-sealed-down-fire-subwoofer-enclosure","title":"Proline X P12-S DF | Single 12\" Sealed Down Fire Subwoofer Enclosure","description":"\u003cdiv class=\"df-wrap\"\u003e\n\u003cstyle\u003e\n.df-wrap{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;line-height:1.7;color:#cbd5e1 !important;}\n.df-wrap p{color:#cbd5e1 !important;margin:0 0 14px 0;}\n.df-wrap ul{margin:0 0 16px 0;padding-left:20px;}\n.df-wrap li{color:#cbd5e1 !important;margin-bottom:8px;}\n.df-wrap strong{color:#67e8f9 !important;}\n.df-wrap a{color:#22d3ee !important;font-weight:700;text-decoration:underline;}\n.df-hero{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:32px 28px;margin-bottom:28px;}\n.df-eyebrow{display:inline-block;color:#67e8f9 !important;font-size:0.72em;font-weight:700;letter-spacing:0.14em;text-transform:uppercase;margin-bottom:10px;}\n.df-hero h2{color:#ffffff 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!important;}\n.df-clearance{background:#0f172a !important;border:2px solid #06b6d4 !important;border-radius:8px;padding:22px 24px;margin:28px 0;}\n.df-clearance-label{display:inline-block;background:#06b6d4 !important;color:#04222b !important;font-size:0.68em;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;padding:4px 11px;border-radius:3px;margin-bottom:12px;}\n.df-clearance h3{margin-top:0;}\n.df-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:24px 0;}\n@media(max-width:600px){.df-card-grid{grid-template-columns:1fr;}}\n.df-card{background:#1a2740 !important;border:1px solid #2c405c !important;border-top:3px solid #06b6d4 !important;border-radius:6px;padding:22px;}\n.df-card-label{display:inline-block;background:#06b6d4 !important;color:#04222b !important;font-size:0.68em;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;padding:3px 10px;border-radius:3px;margin-bottom:10px;}\n.df-card h4{margin:0 0 10px 0;}\n.df-card-divider{height:2px;background:#06b6d4 !important;width:32px;margin-bottom:12px;border-radius:2px;}\n.df-card p{font-size:0.93em;color:#b6c4d6 !important;margin:0;line-height:1.65;}\n.df-card p strong{color:#67e8f9 !important;}\n.df-table{width:100% !important;border-collapse:collapse;margin:22px 0;font-size:0.94em;}\n.df-table th{background:#0e7490 !important;color:#ffffff !important;text-align:left;padding:11px 14px;font-weight:700;font-size:0.9em;letter-spacing:0.04em;text-transform:uppercase;border-bottom:1px solid #22384f !important;}\n.df-table td{padding:10px 14px;border-bottom:1px solid #22384f !important;color:#dbe4ef !important;background:#111c30 !important;}\n.df-table tr:nth-child(even) td{background:#1a2740 !important;}\n.df-table td:first-child{font-weight:600;color:#67e8f9 !important;width:34%;}\n.df-chartbox{display:block !important;width:100% !important;max-width:100% !important;margin:22px 0 !important;}\n.df-chart{display:block !important;width:100% !important;max-width:100% !important;height:auto !important;}\n.df-cta{background:linear-gradient(135deg,#0f172a 0%,#0e7490 100%) !important;border-radius:8px;padding:28px 26px;margin:32px 0 0 0;text-align:center;}\n.df-cta h3{color:#ffffff !important;margin:0 0 10px 0;}\n.df-cta p{color:#e2e8f0 !important;margin:0;font-size:0.97em;}\n.df-cta a{color:#a5f3fc !important;}\n\u003c\/style\u003e\n\n\u003cdiv class=\"df-hero\"\u003e\n\u003cspan class=\"df-eyebrow\"\u003eProline X | Performance Down Fire\u003c\/span\u003e\n\u003ch2\u003eA Full Cubic Foot for a 12, Under Seven Inches Tall.\u003c\/h2\u003e\n\u003cp\u003eA shallow sealed enclosure for a single 12 inch subwoofer. The driver faces down, the top of the cabinet stays flat and usable, and the whole thing stands 8.5 inches tall with the feet installed. Most 12 inch boxes that hold this much air are twice this height.\u003c\/p\u003e\n\u003cdiv class=\"df-badges\"\u003e\n\u003cspan class=\"df-badge\"\u003e1.00 CU FT NET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e6.75 IN CABINET\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003e6 IN MAX DEPTH\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eDOWN FIRE OR FORWARD FIRE\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eFEET INCLUDED\u003c\/span\u003e\n\u003cspan class=\"df-badge\"\u003eBUILT IN TULLAHOMA, TN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-warn\"\u003e\n\u003cspan class=\"df-warn-label\"\u003eRead This First\u003c\/span\u003e\n\u003ch3\u003eCheck Your Driver Depth\u003c\/h3\u003e\n\u003cp\u003eMaximum driver mounting depth is \u003cstrong\u003e6 inches\u003c\/strong\u003e. That is workable for a good number of 12s, but plenty of high excursion 12 inch drivers need 7 inches or more, and those will not fit.\u003c\/p\u003e\n\u003cp\u003eCheck your driver's published mounting depth against 6 inches before you order. If it needs more, our forward fire P12-S is the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eBuilt Around a Constraint, Not Around a Driver\u003c\/h3\u003e\n\u003cp\u003ePerformance Down Fire enclosures are sized by driver diameter rather than cut for one specific subwoofer. This one takes any 12 inch driver with an \u003cstrong\u003e11.13 inch cutout\u003c\/strong\u003e and a mounting depth of 6 inches or less, and gives it \u003cstrong\u003e1.00 cubic foot of net airspace\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe design brief was height. Getting a full cubic foot into a 6.75 inch cabinet means the footprint has to grow, which is why this enclosure is 29.5 inches wide. Turning the driver toward the floor is what makes the height possible, because the baffle no longer has to face outward into the cargo area.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eWhy Down Fire\u003c\/h3\u003e\n\u003cp\u003eTurning the driver toward the floor is not a styling decision. It changes what the enclosure does to the space around it and what the space around it can do to the enclosure.\u003c\/p\u003e\n\u003cdiv class=\"df-card-grid\"\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eBoundary\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eThe Floor Is Right There\u003c\/h4\u003e\n\u003cp\u003eThe driver radiates into a hard surface 1.75 inches away. In a trunk or cargo area that reinforcement, combined with cabin gain, is what makes a compact sealed box feel bigger than its airspace.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eProtection\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNothing Lands on the Cone\u003c\/h4\u003e\n\u003cp\u003eGroceries, tools, luggage, and dogs never touch a surround that is facing down. The most common cause of a damaged subwoofer in a daily driven vehicle is \u003cstrong\u003ecargo, not power\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003ePackaging\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eA Flat Top You Can Use\u003c\/h4\u003e\n\u003cp\u003eNo basket, no grille, no protrusion. The top of the cabinet is a flat carpeted surface, which in most vehicles means you get the cargo floor back instead of building around a box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"df-card\"\u003e\n\u003cspan class=\"df-card-label\"\u003eFlexibility\u003c\/span\u003e\u003cdiv class=\"df-card-divider\"\u003e\u003c\/div\u003e\n\u003ch4\u003eNot Locked Into One Orientation\u003c\/h4\u003e\n\u003cp\u003eThe feet ship without predrilled holes on purpose. Mount them where your floor wants them, or leave them off entirely and run the cabinet \u003cstrong\u003eforward firing\u003c\/strong\u003e if your install calls for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-clearance\"\u003e\n\u003cspan class=\"df-clearance-label\"\u003eFeet and Clearance\u003c\/span\u003e\n\u003ch3\u003eWhat Ships With the Enclosure\u003c\/h3\u003e\n\u003cp\u003eFour feet come standard with every Performance Down Fire enclosure. There is no upgrade tier and no separate accessory to buy.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eABS and carbon fiber composite\u003c\/strong\u003e, machined in house on the same equipment as our terminal cups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75 inches of lift\u003c\/strong\u003e, which sets the working air gap between the baffle and the floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo predrilled mounting holes\u003c\/strong\u003e, so the enclosure is never locked into a single orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall height with feet installed: 8.5 inches.\u003c\/strong\u003e Cabinet alone is 6.75 inches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eKeep the gap clear.\u003c\/strong\u003e The 1.75 inch space under the baffle is the air path, not empty room. A spare tire, a toolbox, or a folded moving blanket pressed against the opening will choke the output. Down fire systems that sound dead almost always have something jammed underneath them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section-alt\"\u003e\n\u003ch3\u003eHow It Is Built\u003c\/h3\u003e\n\u003cdiv class=\"df-highlight\"\u003e\n\u003ch3\u003eCabinet\u003c\/h3\u003e\n\u003cp\u003eCut on our ShopSabre CNC from Langboard Elite MDF and assembled with V groove and dado joinery, with internal bracing and a single 0.75 inch baffle. Every panel meets on a machined joint rather than a butt seam, so the cabinet stays rigid and puts its energy into the driver instead of the panels.\u003c\/p\u003e\n\u003ch3\u003eMounting Hardware\u003c\/h3\u003e\n\u003cp\u003eThis is a generic enclosure sized by driver diameter, which means we do not know which subwoofer is going into it and cannot machine a bolt pattern for it. \u003cstrong\u003eThe baffle ships as a solid mounting flange and you drill your own mounting holes to match your driver.\u003c\/strong\u003e Threaded inserts are a feature of our Performance Optimized line, where the enclosure is cut for one named subwoofer and the bolt circle is drawn in CAD from the actual driver.\u003c\/p\u003e\n\u003cp\u003eThe MDF we use is dense. \u003cstrong\u003ePredrill your mounting holes.\u003c\/strong\u003e Driving screws straight into it without a pilot hole will split the baffle or strip the screw.\u003c\/p\u003e\n\u003ch3\u003eWiring and Damping\u003c\/h3\u003e\n\u003cp\u003eThe Proline X ABS and carbon fiber composite terminal cup is \u003cstrong\u003eside mounted\u003c\/strong\u003e, which keeps the connection accessible with the enclosure sitting on its feet. Pre wired with 12 gauge OFC. Polyfill is installed before the enclosure leaves the shop.\u003c\/p\u003e\n\u003ch3\u003eFinish\u003c\/h3\u003e\n\u003cp\u003eDark gray trunk liner standard, plush black available. The lasered acrylic badge mounts on the front face rather than the woofer face, so it stays visible in the down fire orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eThe cabinet measures \u003cstrong\u003e29.5 inches wide by 14.5 inches deep by 6.75 inches tall\u003c\/strong\u003e, or 8.5 inches tall with the feet installed and the enclosure sitting in the down fire position.\u003c\/p\u003e\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eMeasure the width first.\u003c\/strong\u003e At 29.5 inches this is a full width enclosure, and that width is the price of getting a full cubic foot into a cabinet under 7 inches tall. Height is the spec that makes this design interesting, but width is the spec that decides whether it goes in your vehicle.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003ch3\u003eEnclosure Performance\u003c\/h3\u003e\n\u003cp\u003eThis enclosure is sized by driver diameter rather than cut for one subwoofer, so there is no single response curve for it. What the alignment does depends entirely on the driver you put in, and specifically on its total Q.\u003c\/p\u003e\n\u003cp\u003eThe table below models three driver profiles across the range you find in 12 inch subwoofers, calculated in 1.00 cubic foot. \u003cstrong\u003eThese are illustrative profiles, not published specifications for any particular subwoofer.\u003c\/strong\u003e Use them to understand the shape of the outcome, then run your own driver's real numbers.\u003c\/p\u003e\n\u003ctable class=\"df-table\"\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver Profile (modeled)\u003c\/th\u003e\n\u003cth\u003eQtc\u003c\/th\u003e\n\u003cth\u003efc\u003c\/th\u003e\n\u003cth\u003eF3\u003c\/th\u003e\n\u003cth\u003eResult\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLow Q, Qts 0.40\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 30 Hz, Vas 1.30 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e0.607\u003c\/td\u003e\n\u003ctd\u003e45.5 Hz\u003c\/td\u003e\n\u003ctd\u003e54.2 Hz\u003c\/td\u003e\n\u003ctd\u003eOverdamped. Rolls off early, thin on the bottom.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\n\u003cstrong style=\"color:#86efac !important;\"\u003eMid Q, Qts 0.50\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#86efac !important;font-weight:400;font-size:0.9em;\"\u003eFs 28 Hz, Vas 1.55 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e0.798\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e44.7 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003e40.2 Hz\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background:#14532d !important;color:#86efac !important;\"\u003e\u003cstrong style=\"color:#86efac !important;\"\u003eNear textbook. The target for this box.\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Q, Qts 0.65\u003cbr\u003e\u003cspan style=\"color:#94a3b8 !important;font-weight:400;font-size:0.9em;\"\u003eFs 26 Hz, Vas 1.80 cu ft\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e1.088\u003c\/td\u003e\n\u003ctd\u003e43.5 Hz\u003c\/td\u003e\n\u003ctd\u003e33.1 Hz\u003c\/td\u003e\n\u003ctd\u003eImpact alignment. Lift around 43 Hz, extends lower.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"df-chartbox\"\u003e\n\u003csvg class=\"df-chart\" width=\"1260\" height=\"420\" viewbox=\"0 0 1260 420\" preserveaspectratio=\"xMidYMid meet\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display:block !important;width:100% !important;max-width:100% !important;height:auto !important;\"\u003e\n\u003crect x=\"0\" y=\"0\" width=\"1260\" height=\"420\" fill=\"#0b1424\"\u003e\u003c\/rect\u003e\n\u003crect x=\"90\" y=\"50\" width=\"1080\" height=\"300\" fill=\"#111c30\" stroke=\"#2c405c\" stroke-width=\"1\"\u003e\u003c\/rect\u003e\n\u003cline x1=\"280\" y1=\"50\" x2=\"280\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"520\" y1=\"50\" x2=\"520\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"845\" y1=\"50\" x2=\"845\" y2=\"350\" stroke=\"#22384f\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"110\" x2=\"1170\" y2=\"110\" stroke=\"#334155\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"90\" y1=\"155\" x2=\"1170\" y2=\"155\" stroke=\"#64748b\" stroke-width=\"1\" stroke-dasharray=\"6,5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"1178\" y=\"160\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-3 dB\u003c\/text\u003e\n\u003ctext x=\"1178\" y=\"115\" font-size=\"15\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e0 dB\u003c\/text\u003e\n\u003cpolyline points=\"90,335 112,323 135,312 158,301 180,290 202,280 225,269 247,259 270,249 292,240 315,230 337,221 360,213 382,205 405,197 428,189 450,182 472,176 495,170 518,164 540,159 562,154 585,150 608,146 630,142 652,139 675,136 698,133 720,131 742,129 765,127 787,125 810,123 832,122 855,121 877,120 900,119 923,118 945,117 968,116 990,116 1012,115 1035,115 1058,114 1080,114 1102,113 1125,113 1147,113 1170,113\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,298 112,284 135,270 158,257 180,243 202,229 225,215 247,201 270,187 292,174 315,161 337,149 360,137 382,126 405,116 428,108 450,100 472,94 495,90 518,87 540,85 562,84 585,84 608,84 630,85 652,86 675,87 698,88 720,90 742,91 765,92 787,94 810,95 832,96 855,97 877,98 900,99 923,100 945,101 968,102 990,103 1012,103 1035,104 1058,104 1080,105 1102,105 1125,106 1147,106 1170,106\" fill=\"none\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\u003cpolyline points=\"90,317 112,304 135,292 158,279 180,267 202,255 225,243 247,231 270,220 292,208 315,198 337,187 360,177 382,168 405,160 428,152 450,144 472,138 495,132 518,127 540,123 562,120 585,117 608,114 630,112 652,111 675,110 698,109 720,108 742,108 765,107 787,107 810,107 832,107 855,107 877,107 900,107 923,107 945,107 968,108 990,108 1012,108 1035,108 1058,108 1080,108 1102,108 1125,109 1147,109 1170,109\" fill=\"none\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/polyline\u003e\n\u003ctext x=\"82\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e20\u003c\/text\u003e\n\u003ctext x=\"272\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e30\u003c\/text\u003e\n\u003ctext x=\"512\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e50\u003c\/text\u003e\n\u003ctext x=\"833\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e100\u003c\/text\u003e\n\u003ctext x=\"1158\" y=\"375\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e200\u003c\/text\u003e\n\u003ctext x=\"560\" y=\"404\" font-size=\"17\" fill=\"#22d3ee\" font-family=\"sans-serif\" font-weight=\"700\"\u003eFrequency (Hz)\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"56\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e+4\u003c\/text\u003e\n\u003ctext x=\"58\" y=\"190\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-5\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"265\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-10\u003c\/text\u003e\n\u003ctext x=\"48\" y=\"340\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003e-15\u003c\/text\u003e\n\u003ctext x=\"102\" y=\"36\" font-size=\"16\" fill=\"#67e8f9\" font-family=\"sans-serif\" font-weight=\"700\"\u003eModeled in 1.00 cu ft. Anechoic half-space, no cabin gain.\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"270\" x2=\"870\" y2=\"270\" stroke=\"#22d3ee\" stroke-width=\"4.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"276\" font-size=\"16\" fill=\"#e2e8f0\" font-family=\"sans-serif\" font-weight=\"700\"\u003eMid Q, Qts 0.50\u003c\/text\u003e\n\u003cline x1=\"820\" y1=\"302\" x2=\"870\" y2=\"302\" stroke=\"#64748b\" stroke-width=\"2.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"882\" y=\"308\" font-size=\"16\" fill=\"#94a3b8\" font-family=\"sans-serif\"\u003eLow Q 0.40 and High Q 0.65\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-alert\"\u003e\u003cp\u003e\u003cstrong\u003eWhat the numbers are telling you.\u003c\/strong\u003e A 1.00 cubic foot sealed box wants a 12 in the middle of the Q range. Drop in a low Q driver and you get an overdamped alignment that gives up real low end. Drop in a high Q driver and you get a lift in the upper bass with deeper extension, which is a legitimate choice if impact is what you want. There is no wrong answer here, but there is a wrong assumption, which is that any 12 will behave the same way in this box.\u003c\/p\u003e\u003c\/div\u003e\n\n\u003ch4\u003eAbout the Polyfill\u003c\/h4\u003e\n\u003cp\u003eThe 1.00 cubic foot figure is \u003cstrong\u003ephysical net airspace\u003c\/strong\u003e, measured after subtracting bracing and typical driver displacement. It is the number to enter into a modeling program. Polyfill is installed at the correct density before the enclosure ships, which typically makes a sealed box behave as though it were roughly 10 to 15 percent larger, so this cabinet tends to act like 1.10 to 1.15 cubic feet in practice. We quote the physical volume rather than the effective one, so the number you see is the number you can verify.\u003c\/p\u003e\n\u003cp\u003eRun your own driver's parameters through the \u003ca href=\"\/pages\/sealed-box-calculator\"\u003eSealed Box Calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-section\"\u003e\n\u003cp\u003eFull dimensions, cutout, mounting depth, and hardware details are listed under the \u003cstrong\u003eEnclosures\u003c\/strong\u003e tab.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"df-cta\"\u003e\n\u003ch3\u003eShallow, Down Firing, Built in Tennessee.\u003c\/h3\u003e\n\u003cp\u003eEvery Performance Down Fire enclosure is built to order in Tullahoma, Tennessee on our own CNC equipment. Questions on driver depth or whether your subwoofer suits this alignment, call or text 707-999-3071.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Proline X","offers":[{"title":"Dark Gray Trunkliner","offer_id":44465486233689,"sku":"P12-S DF-GRY","price":179.99,"currency_code":"USD","in_stock":true},{"title":"Plush Black","offer_id":44465486266457,"sku":"P12-S DF-BLK","price":189.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/P12-SDF.png?v=1785896216","url":"https:\/\/audiointensity.com\/products\/proline-x-p12-s-df-single-12-sealed-down-fire-subwoofer-enclosure","provider":"Audio Intensity","version":"1.0","type":"link"}