Proline X P10-S DF | Single 10" Sealed Down Fire Subwoofer Enclosure

Proline X | Performance Down Fire Five and a Half Inches Tall. Firing Into the Floor. A shallow sealed enclosure for a single 10 inch subwoofer, built to disappear under a cargo cover or behind a seat back. The driver faces down, the top of the cabinet stays flat and usable, and the whole thing stands 7.25 inches tall with the feet installed. 0.60 CU FT NET 5.5 IN CABINET 4.75 IN MAX DEPTH DOWN FIRE OR FORWARD FIRE FEET INCLUDED BUILT IN TULLAHOMA, TN Read This First This Is a Shallow Mount Enclosure Maximum driver mounting depth is 4.75 inches. That is the number that decides whether this enclosure works for you, and it rules out the majority of conventional 10 inch subwoofers, which typically need somewhere between 5.5 and 7 inches. This box is built for shallow mount and slim profile 10s. Check your driver's published mounting depth against 4.75 inches before you order. If your driver needs more than that, our forward fire P10-S allows 6.25 inches and is the better choice. Built Around a Constraint, Not Around a Driver Performance Down Fire enclosures are sized by driver diameter rather than cut for one specific subwoofer. This one takes any 10 inch driver with a 9.25 inch cutout and a mounting depth of 4.75 inches or less, and gives it 0.60 cubic feet of net airspace. The design brief was height. At 5.5 inches of cabinet the enclosure fits places a conventional 10 inch box cannot go, and turning the driver toward the floor is what makes that height possible, because the baffle no longer has to face outward into the cargo area. Why Down Fire Turning 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. Boundary The Floor Is Right There The 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. Protection Nothing Lands on the Cone Groceries, 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 cargo, not power. Packaging A Flat Top You Can Use No 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. Flexibility Not Locked Into One Orientation The feet ship without predrilled holes on purpose. Mount them where your floor wants them, or leave them off entirely and run the cabinet forward firing if your install calls for it. Feet and Clearance What Ships With the Enclosure Four feet come standard with every Performance Down Fire enclosure. There is no upgrade tier and no separate accessory to buy. ABS and carbon fiber composite, machined in house on the same equipment as our terminal cups. 1.75 inches of lift, which sets the working air gap between the baffle and the floor. No predrilled mounting holes, so the enclosure is never locked into a single orientation. Overall height with feet installed: 7.25 inches. Cabinet alone is 5.5 inches. Keep the gap clear. 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. How It Is Built Cabinet Cut 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. Mounting Hardware This 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. The baffle ships as a solid mounting flange and you drill your own mounting holes to match your driver. 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. The MDF we use is dense. Predrill your mounting holes. Driving screws straight into it without a pilot hole will split the baffle or strip the screw. Wiring and Damping The Proline X ABS and carbon fiber composite terminal cup is side mounted, 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. Finish Dark 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. Fitment The cabinet measures 24.5 inches wide by 13.5 inches deep by 5.5 inches tall, or 7.25 inches tall with the feet installed and the enclosure sitting in the down fire position. Two numbers decide this purchase. Driver mounting depth against 4.75 inches, and cabinet height against the space you have. Width and depth are generous because the height had to come from somewhere. Measure the footprint before you order. Enclosure Performance This 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. The table below models three driver profiles across the range you find in shallow mount 10s, calculated in 0.60 cubic feet. These are illustrative profiles, not published specifications for any particular subwoofer. Use them to understand the shape of the outcome, then run your own driver's real numbers. Driver Profile (modeled) Qtc fc F3 Result Low Q, Qts 0.40 Fs 32 Hz, Vas 0.70 cu ft 0.589 47.1 Hz 58.4 Hz Overdamped. Rolls off early, thin on the bottom. Mid Q, Qts 0.50 Fs 30 Hz, Vas 0.85 cu ft 0.777 46.6 Hz 42.8 Hz Near textbook. The target for this box. High Q, Qts 0.65 Fs 28 Hz, Vas 1.00 cu ft 1.061 45.7 Hz 35.1 Hz Impact alignment. Lift around 45 Hz, extends lower. -3 dB 0 dB 20 30 50 100 200 Frequency (Hz) +4 -5 -10 -15 Modeled in 0.60 cu ft. Anechoic half-space, no cabin gain. Mid Q, Qts 0.50 Low Q 0.40 and High Q 0.65 What the numbers are telling you. A 0.60 cubic foot sealed box wants a driver 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 10 will behave the same way in this box. About the Polyfill The 0.60 cubic foot figure is physical net airspace, 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. We quote the physical volume rather than the effective one, so the number you see is the number you can verify. Run your own driver's parameters through the Sealed Box Calculator. Full dimensions, cutout, mounting depth, and hardware details are listed under the Enclosures tab. Shallow, Down Firing, Built in Tennessee. Every 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 931-563-5151.