Proline X
Performance Optimized Down Fire Sealed 10" Dual Enclosure | Audiomobile GT2
SKU: PODF 10D-S AM-BLK-BO
- Best For: Down fire trunk and cargo floor builds where height is the constraint
- Configuration: Dual 10" Sealed Down Fire, cut for Audiomobile GT2 2010
- Volume / Alignment: 1.20 ft³ Net common chamber, Qtc 1.05, F3 36.4Hz
- Sonic Character: Punchy, impact-forward, high-output
Financing available — choose Shop Pay Installments at checkout.
Performance Optimized Down Fire Sealed 10" Dual Enclosure | Audiomobile GT2
Two Audiomobile GT2 2010s. Eight and a Half Inches Tall. Firing Into the Floor.
A sealed dual 10 enclosure cut to the Audiomobile GT2 2010 and nothing else. The drivers face down, the cargo floor stays flat and usable, and the cabinet clears rear deck lines that a conventional dual 10 box cannot get near.
Built for One Driver, Not for a Size Class
Performance Optimized enclosures are engineered around a specific subwoofer. This one is cut to the Audiomobile GT2 2010, a 10 inch driver with 400 watts RMS of power handling, 11.9mm of one way Xmax, and only 4.25 inches of mounting depth. Those numbers are unusual together, and they are what make a cabinet this shallow possible in the first place.
The GT2 2010 asks for a small chamber. Audiomobile's own minimum sealed figure is 0.50 cubic feet. This enclosure gives each driver 0.60 cubic feet of net airspace in a common chamber, which sits comfortably inside the driver's working range while keeping the cabinet down to 8.5 inches of external height. The cutouts are 9.2 inches, matched to the driver's gasket ID, and the mounting pattern comes from the actual driver rather than a spec sheet.
Why Down Fire
Turning the drivers 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.
The Floor Is Right There
The drivers radiate 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.
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.
A Flat Top You Can Use
No baskets, no grilles, no protrusions. 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.
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.
What Ships With the Enclosure
Four feet come standard with every Performance Optimized 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. Set them where they suit your floor, or omit them and run forward firing.
- Overall height with feet installed: 10.25 inches. Cabinet alone is 8.5 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.
Before You Buy: Read the Impedance
The GT2 2010 runs a single 3 ohm nominal voice coil at 2.8 ohms DCR. This is not a standard car audio impedance and there is no dual 2 ohm or dual 4 ohm version of the driver. Two of them in this enclosure give you exactly two options.
- Parallel, 1.5 ohms nominal. Requires a 1 ohm stable monoblock. An amplifier in the 800 to 1000 watt RMS range is the clean match and the configuration we recommend.
- Series, 6 ohms nominal. Most amplifiers will drive 6 ohms, but output falls to roughly 40 to 50 percent of the 1 ohm rating. This is the path when your amplifier is not 1 ohm stable.
Settle the amplifier question before the enclosure ships. It is the single decision that determines what this system is capable of.
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 double baffle at 1.5 inches. Every panel meets on a machined joint rather than a butt seam, so the cabinet stays rigid and puts its energy into the drivers instead of the panels. Internal height under the top panel is 6.25 inches against the driver's 4.25 inch mounting depth, so the motors clear with room to breathe.
Mounting Pattern Drawn In House
We have the GT2 2010 in the shop. We measured it, built the bolt circle in CAD, and the nutsert locations and the cutout are machined in the same operation from the same origin on the router. The holes cannot drift relative to each other, because the machine never re-references between them. Threaded inserts are installed and 8/32 machine screws are supplied, so the drivers can come out and go back in as many times as the build requires.
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 to both driver positions. Polyfill is installed before the enclosure leaves the shop.
Finish
Charcoal 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
External dimensions are 29.5 inches wide by 8.5 inches tall by 16 inches deep, or 10.25 inches tall with the feet installed. The 8.5 inch cabinet height clears the rear deck line on most full size sedans and sits under most cargo covers.
Measure the width first. At 29.5 inches this is a full width enclosure. Height is the spec that makes this design interesting, but width is the spec that decides whether it goes in your vehicle. There is no compact or behind seat version of this enclosure.
Enclosure Performance
Every Proline X enclosure is designed to a target alignment rather than a convenient box size. These are the sealed alignment figures for the Audiomobile GT2 2010 across the usable volume range, calculated from the published Thiele-Small parameters: Fs 27.5 Hz, Qts 0.61, Vas 1.17 cu ft.
| Volume Per Driver | Qtc | fc | F3 |
|---|---|---|---|
| 0.50 cu ft (minimum) | 1.115 | 50.3 Hz | 37.9 Hz |
| 0.60 cu ft (this enclosure) | 1.048 | 47.2 Hz | 36.4 Hz |
| 0.75 cu ft (maximum practical) | 0.976 | 44.0 Hz | 35.0 Hz |
Read the curve honestly. The GT2 2010 has a Qts of 0.61, which means it cannot reach a textbook 0.707 Qtc in any enclosure that fits in a vehicle. You would need 3.41 cu ft per driver. At 0.60 cu ft this alignment lands at Qtc 1.048, which puts a roughly 1.5 dB lift around 47 Hz and an anechoic F3 of 36.4 Hz. That is an impact alignment, not a flat one. Loaded into a trunk or cargo floor and firing down, cabin gain fills in below the knee and the result is a punchy, high output system. If you want a flat sealed alignment above all else, this is not the driver or the enclosure for it.
Run your own numbers with the Sealed Box Calculator.
Full dimensions, cutout, mounting depth, and hardware details are listed under the Enclosures tab.
Cut for the GT2 2010. Built in Tennessee.
Order it as a bare enclosure or loaded with a matched pair of Audiomobile GT2 2010 subwoofers, wired and ready to connect. Every Performance Optimized Down Fire enclosure is built to order in Tullahoma, Tennessee. Questions on fitment or amplifier matching, call or text 707-999-3071.
| Enclosure Type | Sealed, Down Fire |
| Configuration | Dual 10", common chamber, cut for Audiomobile GT2 2010 |
| External Dimensions | 29.5" W x 8.5" H x 16" D |
| Overall Height With Feet | 10.25" |
| Net Internal Volume | 1.20 ft³ total, 0.60 ft³ per driver |
| System Qtc | 1.048 |
| System Resonance (fc) | 47.2 Hz |
| F3 (anechoic) | 36.4 Hz |
| Feet | Four ABS/Carbon Fiber composite, machined in house, included, no predrilled holes |
| Baffle to Floor Clearance | 1.75" |
| Subwoofer Cutout | 9.2" |
| Driver Mounting Depth | 4.25" required, 6.25" available |
| Front Panel Thickness | 1.5" Double Baffle |
| Panel Thickness | 3/4" (18mm) |
| Material | Langboard Elite MDF |
| Joinery | V-groove and dado, CNC cut on ShopSabre |
| Internal Bracing | Yes, series standard |
| Threaded Inserts | Installed, 8/32 machine screws supplied, pattern drawn in house from measured driver |
| Terminal Cup | Proline X ABS/Carbon Fiber, side mounted, stainless hardware |
| Wiring | Pre-wired 12g OFC to both driver positions |
| Damping | Polyfill installed |
| Carpet | Charcoal Gray Trunk Liner standard, Plush Black available |
| Badge | Lasered acrylic, front face mounted |
| Driver Impedance | 3 ohm nominal each (2.8 ohm DCR), single coil |
| System Impedance | 1.5 ohm parallel or 6 ohm series |
| Weight | 35 lb box only, 55 lb loaded |
| Warranty | 1-Year Limited (enclosure), driver per manufacturer warranty |
| Built In | Tullahoma, Tennessee |
Built From a Spec Sheet, Not a Sales Sheet
Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF, 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure, because we chose the material based on those numbers, not on price or availability.
Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.
Langboard Elite MDF: Published Mill Data
| Property | Value | Why It Matters |
|---|---|---|
| Panel Stock | Langboard Elite MDF | Named, verifiable panel source, not generic "high-density MDF" |
| Thickness | 3/4" (18mm) | Industry standard for subwoofer enclosures; panels below this flex under pressure |
| Density | 48.5 lbs/ft³ | Higher density = less porosity, better screw retention, reduced resonance |
| Internal Bond | 200 psi | Measures resistance to delamination under sustained internal pressure. The most enclosure-relevant spec on this sheet |
| Modulus of Rupture (MOR) | 4,200 psi | Bending strength before the panel breaks, relevant for larger unsupported baffle spans |
| Modulus of Elasticity (MOE) | 410,000 psi | Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance |
| Face Screw Holding | 325 lbs | How firmly the panel surface holds a screw; critical for baffle joint integrity over time |
| Edge Screw Holding | 250 lbs | Panel edge retention, relevant for every joint that isn't face-to-face |
200 psi: The Number That Actually Matters for Enclosures
The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually. The symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.
410,000 psi MOE: Less Flex, Less Resonance
The modulus of elasticity measures panel stiffness, its resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level, not the panel level. The bass you hear comes from the driver, not the box.
325 lb Face / 250 lb Edge: Joints That Stay Locked
Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint, where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.
Named Panel Stock: Not "Premium MDF"
The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification. It is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.
Why Proline X?
Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements — and in how the box holds up two years into daily use.
CNC-Cut to Spec
Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.
Handcrafted in USA
Hand-assembled at our facility in Tullahoma, TN. Every enclosure is inspected before it ships.
Tuned to the Build
Internal volume and port geometry are calculated to spec and CNC-cut to exact dimensions. The box performs the same way every time.
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