Proline X
Proline X Micro Series Dual 15" Sealed Enclosure | Built for ResoNix GUS-15
SKU: M15D-S Gus
- Best For: Maximum-output SQ and competition builds — dual-amp configurations, show vehicles, trunk and cargo floor installs at the largest depth in the Micro Series
- Power: 3,000W RMS combined (1,500W RMS per ResoNix GUS-15)
- Topology/Class: Sealed / Dual Chamber / 1" Walls / Double-Face Baffle / Dowel Reinforced / Two Terminal Cups / DSP Required for Flat Response
- Sonic Character: Maximum extension, ultra-low distortion, exact 0.707 Qtc per chamber — dual Klippel-verified GUS-15 performance hitting ResoNix's acoustic target on both sides
Financing available — choose Shop Pay Installments at checkout.
Proline X Micro Series Dual 15" Sealed Enclosure | Built for ResoNix GUS-15
Dual GUS-15. 2.85 cu ft Gross.
1.35 cu ft Acoustic Per Driver — Exactly ResoNix's Target.
Two ResoNix GUS-15 drivers. Two acoustically isolated sealed chambers — each with its own terminal cup. Each chamber is built to 1.425 cubic feet gross, delivering 1.353 cubic feet of net acoustic airspace per driver after displacement. Exactly ResoNix's published 1.35 cubic foot target for 0.707 Qtc. 3,000 watts RMS combined. The highest-output enclosure in the Proline X Micro Series.
1.425 cu ft Per Chamber — 1.35 cu ft Acoustic After Displacement
ResoNix publishes a 0.707 Qtc target of 1.35 cubic feet of net acoustic airspace for the GUS-15. The GUS-15 has a driver displacement of 0.072 cubic feet. Each chamber in the M15D-S GUS is built to 1.425 cubic feet gross — after the driver is installed, each GUS-15 sees 1.353 cubic feet of net acoustic airspace, hitting ResoNix's 1.35 cubic foot target precisely. Total gross enclosure volume is 2.85 cubic feet. The acoustically meaningful figure for each driver is 1.35 cubic feet per chamber.
This is exactly double the volume of the single M15-S GUS enclosure, by design. The Proline X Micro Series approach to dual builds is to scale the volume linearly — the dual enclosure is built to deliver the same acoustic conditions per driver as the single. Both drivers in this enclosure load into identical acoustic environments, and both produce identical T/S response curves.
Two GUS-15 Drivers — 3,000W Combined, Maximum Shallow-Mount Output
A single GUS-15 in the correct enclosure produces more output than any other shallow 15" available — 1,500 watts RMS, 25.89mm of Klippel-verified one-way Xmax, and 804.25 cm² of effective cone area. Two GUS-15 drivers in isolated 1.35 cubic foot chambers double the cone displacement and raise the combined power handling to 3,000 watts RMS. This is the highest-output single enclosure in the Proline X Micro Series — there is no comparable shallow-mount dual 15" build at this depth class.
The DSP requirement is unchanged from the single GUS-15 build. Both drivers have Fs of 17.11 Hz and Qts of 0.34 — the same 0.707 Qtc alignment, the same flat anechoic response, the same requirement for active shelf EQ to build the in-cabin curve. A Goldhorn DSP or equivalent processor remains the correct companion. Two drivers produce more output. They do not change the alignment's character.
1" Walls. Double-Face Baffle. Two Terminal Cups. Built for 3,000 Watts.
The M15D-S GUS is constructed to a different structural standard than the rest of the Micro Series. The walls are 1-inch thick Langboard Elite MDF — heavier than the standard 3/4" panels used elsewhere in the series. The front baffle is a double-face build — two bonded layers of Langboard Elite combined into a single rigid panel. Both wall thickness and baffle layering are scaled to the structural demands of 3,000 watts RMS combined across two GUS-15 drivers operating at 25.89mm Xmax each.
The chamber divider is CNC-cut and dado-jointed to the same standard as the exterior walls, with the additional thickness those walls bring. Both chambers maintain their acoustic isolation independently. The stack-fab assembly is reinforced with dowels throughout. Each chamber has its own Proline X terminal cup — one per chamber — eliminating internal cross-chamber wiring and giving each driver its own dedicated amplifier connection path.
Impedance Wiring — Two Separate Terminal Cups
1.35 cu ft Acoustic Per Driver — ResoNix's 0.707 Qtc Target
Each chamber is built to 1.425 cu ft gross. After the GUS-15's 0.072 cu ft displacement, each driver sees 1.353 cu ft of net acoustic airspace — exactly ResoNix's 1.35 cu ft target. Both chambers identical. Both drivers load correctly.
3,000W RMS Combined — Highest in the Micro Series
Two GUS-15 drivers at 1,500W RMS each with 25.89mm Klippel-verified Xmax per driver. Combined cone displacement across 1,608 cm² of effective area — the maximum-output shallow-mount enclosure available.
1" Langboard Elite — Thicker Than Standard Micro Series
External walls are 1-inch thick Langboard Elite MDF, heavier than the 3/4" used elsewhere in the series. At 3,000W RMS the structural demands warrant the additional thickness — panel rigidity scales with the cube of thickness, not linearly.
Double-Face Bonded Baffle — Dowel Reinforced
The front baffle is a double-face bonded build — two layers of Langboard Elite combined into a single rigid panel. The stack-fab assembly is further reinforced with dowels throughout. Baffle resonance at 3,000W is structurally eliminated.
Two Terminal Cups — One Per Chamber, Independently Wired
Each chamber has its own Proline X ABS/carbon fiber terminal cup with stainless hardware and copper ring terminals. Pre-wired internally with 12-gauge OFC to its own driver position. Independent connection paths to each amplifier channel.
Dual Chamber — CNC Divider, Independently Sealed
A CNC-cut, dado-jointed chamber divider at the same 1-inch thickness as the exterior walls separates both driver volumes completely. Neither GUS-15 shares airspace with the other. Both chambers maintain acoustic isolation under sustained 3,000W operation.
8/32 Threaded Inserts — Machine Screws for Both Drivers
Both baffle positions are fitted with 8/32 threaded inserts. Stainless machine screws are included for both GUS-15 drivers. Each driver mounts to steel — consistent clamping force across all eight mounting points per driver, no stripping at 3,000W sustained load.
Wall-Lining Only — Acoustic Volume Unaffected
Polyfill is installed as a light wall-lining application only in both chambers. This dampens internal panel reflections without artificially increasing apparent acoustic volume. Each chamber's 1.35 cu ft net acoustic airspace per driver is unchanged by the polyfill installation.
Active EQ Required — Same Character as the Single GUS-15
Both GUS-15 drivers have Qts of 0.34, Fs of 17.11 Hz. The system Qtc in each chamber targets 0.707 — flat anechoic response requiring active shelf EQ for the in-cabin curve. A Goldhorn DSP is the correct companion. Two drivers make the response louder; they do not change its character.
33mm Minimum Front Clearance — Both Drivers
ResoNix specifies 33mm minimum clearance between the GUS-15's surround and any surface in front of the driver. Confirm this at both driver positions before finalizing the install. At 25.89mm of Xmax, this clearance is the operating envelope of the suspension — not optional.
Two Terminal Cups, Independent Wiring, Maximum Flexibility
Unlike the other Micro Series dual builds, the M15D-S GUS uses two separate Proline X terminal cups — one per chamber, each pre-wired to its own driver with 12-gauge OFC. This gives you complete flexibility in amplifier configuration: run each driver from its own monoblock for maximum power and channel separation, or bridge both into a single high-output amplifier with external wiring. Each chamber's terminal is a standalone connection — there is no internal cross-chamber wiring.
Plan Your Amplifier Configuration Before Ordering
The GUS-15 is available in Dual 2Ω (D2) and Dual 4Ω (D4) configurations. D4 parameters are published. D2 parameters are not yet finalized by ResoNix. For most builds, D4 wired parallel per driver (2Ω each terminal cup) into separate 2Ω-stable monoblocks delivering 1,200–1,500 watts RMS per driver is the practical target. Confirm your amplifier strategy before selecting the voice coil variant.
Where It Fits
At 38" × 18" × 11.25", the M15D-S GUS is the largest enclosure in the Micro Series. The 11.25" depth places it outside the strictly shallow-mount category but it remains significantly more compact than any conventional dual 15" sealed build. Measure carefully:
- Trunk floor — full-size sedans (verify depth clearance)
- Cargo floor — full-size SUVs and vans
- Behind-seat — full-size crew cab trucks (verify cab depth)
- SQ competition — maximum dual-driver GUS-15 output
- High-output DSP systems — where SPL and distortion performance both matter
- Show vehicle builds — maximum bass capability at minimum depth
All Proline X Micro Series enclosures carry a two-year manufacturer's warranty against defects in materials and workmanship. Built and inspected in our Tullahoma, Tennessee facility before shipment. Contact Audio Intensity directly for warranty support.
Made in Tennessee
Every Proline X Micro Series enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee on ShopSabre CNC routers. Chamber volume, divider placement, cutout geometry, dado joint depth, baffle layer count, dowel placement, terminal positioning, and wall thickness are all held to spec on every unit. Langboard Elite MDF throughout — named, mill-documented, published density and bond specifications.
| Compatible Driver | ResoNix GUS-15 (D2 / D4) — Quantity 2 |
| Configuration | Dual 15" — Dual Chamber Sealed |
| Internal Volume (Gross) | 2.85 Cubic Feet Total (1.425 cu ft per chamber) |
| Internal Volume (Net Acoustic) | 2.70 Cubic Feet Total (1.35 cu ft per driver after displacement) |
| Material | Langboard Elite MDF — 1" Walls, Double-Face Baffle |
| Construction | CNC-Cut Stack Fab / Dado Joinery / Dowel Reinforced |
| Wall Thickness | 1 Inch (Exterior Walls and Chamber Divider) |
| Front Panel Thickness | 1.5 Inches (Double-Face Bonded Baffle) |
| External Width | 38 Inches |
| External Height | 18 Inches |
| External Depth | 11.25 Inches |
| Max Mounting Depth | 5.93 Inches (150.7mm) |
| Woofer Opening | 356.17mm Direct Fit — ResoNix GUS-15 (Both Positions) |
| Min Front Clearance | 33mm (Both Drivers) |
| Driver Mounting | 8/32 Threaded Inserts — Stainless Machine Screws Included (Both) |
| Terminal Cups | Two Proline X ABS/Carbon Fiber Cups — Stainless Hardware, Copper Ring Terminals — One Per Chamber, Independently Pre-Wired |
| Internal Wiring | 12-Gauge OFC (Oxygen-Free Copper) |
| Polyfill | Light Wall-Lining Application — Does Not Alter Acoustic Volume |
| Firing Direction | Front-Firing or Downfiring |
| Downfire Feet | Included |
| Finish | Plush Black Automotive Carpet |
| Warranty | 2 Years — Proline X / Audio Intensity |
| Made In | Tullahoma, Tennessee, USA |
Built From a Spec Sheet, Not a Sales Sheet
Every Proline X Micro 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 across the 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 — 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 stack-fab layering 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 Micro 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.