Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems
Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems
Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems
Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems
Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems
Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems

Proline X

Proline X Micro Series 15" Sealed Enclosure | Built for ResoNix GUS-15

SKU: M15-S Gus

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QUICK SPECS
  • Best For: Reference-grade shallow 15" installs. Behind-seat trucks, SUV cargo, trunk floors where 8.25" depth is required and maximum low-frequency output is the goal.
  • Power: Rated for up to 1,500W RMS (ResoNix GUS-15)
  • Topology/Class: Sealed / Double-Layer Stack Fab / Dowel Reinforced / Front-Fire or Downfire
  • Sonic Character: Reference-grade extension, ultra-low distortion, flat 0.707 Qtc alignment. Klippel-verified 25.89mm Xmax on a 15" cone: the most capable shallow-mount 15" available.
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Proline X Micro Series 15" Sealed Enclosure - Fits ResoNix GUS 15 - Proline X Subwoofer Enclosures for car audio systems

Proline X Micro Series 15" Sealed Enclosure | Built for ResoNix GUS-15

Regular price $ 349.99
Sale price $ 349.99 Regular price
Unit price
Enclosure Type Sealed
External Dimensions 28" x 17.5" x 8.25"
Net Volume 1.35 cu ft
Tuning N/A
Cutout Diameter Direct Fit
Front Panel Thickness 1.5"
Max Mounting Depth Direct Fit
INSTALLER'S TAKE

The GUS-15 is the logical conclusion of what the GUS series was built to do. Maximum output, minimum distortion, in the smallest sealed enclosure the driver can operate correctly in. At 1,500 watts RMS with Klippel-verified 25.89mm one-way Xmax across 804.25 cm² of cone area, the output potential of this driver in the correct enclosure exceeds every other build in the Micro Series lineup, including the GUS-12, by a substantial margin.

The volume math is the same methodology as the GUS-12. ResoNix's 0.707 Qtc target for the GUS-15 is 1.35 cubic feet net. Driver displacement is 0.072 cubic feet. Gross build volume is 1.35 + 0.072 = 1.422 cubic feet, so the driver sees exactly 1.35 cubic feet of net acoustic airspace after installation. The 1.42 figure on the listing is net acoustic volume. Most enclosure manufacturers quote gross volume. The difference here is 0.072 cubic feet, about 5% of the total volume, which at this Qts shifts the actual system Qtc by a measurable amount. Building this correctly matters.

Qts of 0.34 and Fs of 17.11 Hz put the GUS-15 in the same SQ-oriented category as the GUS-12. At 1.35 cubic feet sealed, the system Qtc targets 0.707: flat anechoic response extending well below 20 Hz. In a vehicle cabin, boundary gain below 80 Hz reinforces the driver's deep extension in the listening position, producing a full-bandwidth low-frequency response that is not achievable from any other shallow 15" at this depth. The cone area and Xmax are what make the GUS-15 a different proposition than the GUS-12: more displacement means more output at every frequency, particularly below 30 Hz where the 15" advantage over a 12" becomes most audible.

The enclosure is the most structurally demanding single-driver build in the series. The double-layer 1.5-inch baffle, dado joinery, and dowel reinforcement throughout are all warranted at 1,500 watts RMS across a 15-inch driver in a sealed box. The 8.25-inch total enclosure depth means panel walls have more geometric rigidity than the shallow Wavtech builds, but the sheer power level and cone size make the construction standard non-negotiable. Langboard Elite at 200 psi internal bond and 410,000 psi MOE is the correct spec for this application.

The 5.93-inch mounting depth is the deepest driver in this series. At 8.25 inches total enclosure depth, you have approximately 2.3 inches of clearance behind the motor, adequate, but not generous. Confirm your install location provides 8.25 inches of total depth before ordering. The minimum 33mm front clearance requirement from ResoNix also applies. Confirm this against seat, grille, or cargo cover clearance in your vehicle.

For impedance selection: D4 T/S data is published and is the basis for this enclosure's volume calculation. D2 parameters are not yet finalized by ResoNix. For the D4 wired parallel at 2 ohms, target a monoblock delivering 1,000–1,500 watts RMS at 2 ohms stable. For the D2 wired parallel at 1 ohm, you need an amplifier explicitly rated for sustained 1-ohm operation at this power level. This narrows the field considerably. Plan your amplifier selection before choosing the voice coil configuration.

Overview
Specifications
Performance Graphs
Materials
Overview
Micro Series | GUS-15 | Enclosure Only

A Shallow 15" Built Around Real Engineering.
1.42 cu ft. Exactly Right.

The ResoNix GUS-15 produces 1,500 watts RMS from 5.93 inches of mounting depth with Klippel-verified Xmax of 25.89mm. ResoNix publishes a 0.707 Qtc target of 1.35 cubic feet. Add the driver's 0.072 cubic foot displacement and the correct gross build volume is 1.422 cu ft. This enclosure delivers 1.42 cubic feet net, the most structurally demanding, highest-power single-driver build in the Proline X Micro Series.

1.42 Cu Ft Net: Displacement Correct
8.25" Total Depth
17.11 Driver Fs (Hz)
1,500W Driver RMS Rating
Enclosure only. The ResoNix GUS-15 subwoofer is not included and must be purchased separately from ResoNix Sound Solutions. This enclosure is designed exclusively for the GUS-15, the cutout geometry and volume target are specific to this driver.

1.42 cu ft: How the Volume Was Calculated

ResoNix recommends 1.35 cubic feet of net acoustic airspace for the GUS-15 to achieve 0.707 Qtc. The GUS-15 has a published driver displacement of 0.072 cubic feet. Building to a gross volume of 1.35 cubic feet and installing the driver would leave only 1.278 cubic feet net. Noticeably below the recommendation. The correct build target is 1.35 + 0.072 = 1.422 cubic feet gross, so that after driver displacement is subtracted the driver sees exactly 1.35 cubic feet of net acoustic airspace.

This enclosure delivers 1.42 cubic feet net after displacement. Matching ResoNix's acoustic volume recommendation accurately. The 1.42 figure is the net acoustic volume the driver sees, not the gross box volume before displacement is accounted for.

The GUS-15 in a Sealed Enclosure: What the Numbers Mean

The GUS-15's published T/S parameters (D4 variant) show Fs at 17.11 Hz and Qts at 0.34. At 1.35 cubic feet sealed, the system Qtc targets 0.707. Flat anechoic response extending well below 20 Hz. The 15" cone area (Sd of 804.25 cm²) combined with 25.89mm of Klippel-verified one-way Xmax produces a displacement volume that translates directly to output. A 15" driver at this Xmax in the correct sealed enclosure delivers low-frequency output that no shallow 12", including the GUS-12, can match at the same power level.

Like the GUS-12, this is an SQ-oriented driver engineered for accuracy and deep extension. The 0.707 Qtc alignment produces a flat anechoic response with the low-frequency reach the driver's motor and suspension are designed to deliver. In a vehicle cabin, boundary gain below 80 Hz reinforces the driver's deep extension in the listening position. The GUS-15 in this enclosure is the most capable shallow-mount bass system available at this depth.

1,500W RMS Demands a Different Level of Construction

At 1,500 watts RMS the GUS-15 generates more internal pressure than any other single driver in the Micro Series lineup by a significant margin. The front baffle is a double-layer stack-fab build, two CNC-cut Langboard Elite MDF panels bonded to 1.5 inches total thickness. The stack-fab assembly is further reinforced with dowels throughout the build, adding mechanical alignment and shear resistance at every panel joint beyond what layer adhesion alone provides.

The 8.25-inch total depth gives panel walls more inherent geometric rigidity than the ultra-shallow builds in this series, but at 1,500 watts the increased excursion load and cone area of a 15" driver means the structural demands on every panel and joint are correspondingly higher. Langboard Elite MDF at 200 psi internal bond and 410,000 psi MOE is the correct panel spec for this application, not because it is the cheapest option that passes, but because it is the named, documented spec that holds under sustained high-power use.

Volume

1.42 cu ft Net: 1.35 Target + 0.072 Displacement


ResoNix's 0.707 Qtc target is 1.35 cu ft net. GUS-15 driver displacement is 0.072 cu ft. This enclosure is built to 1.35 + 0.072 = 1.422 gross volume, delivering exactly 1.35 cu ft net acoustic airspace after the driver is installed.

Output

Klippel-Verified 25.89mm Xmax: 15" Cone Area


Xmax of 25.89mm at BL 70% across a 804.25 cm² effective cone area: the combination that defines real-world output capability. This is measured performance on a Klippel LSI system, not a manufacturer Xmax claim.

Baffle

1.5" Double-Layer: Dowel Reinforced Stack Fab


Two bonded layers of Langboard Elite 3/4" MDF at 1.5 inches total, further reinforced with dowels throughout the stack-fab assembly. At 1,500 watts RMS, baffle resonance and panel flex are structural failure modes. This construction eliminates both.

Mounting

8/32 Threaded Inserts: Machine Screws Included


The baffle is fitted with 8/32 threaded inserts on the back face. Stainless machine screws are included. The GUS-15 mounts to steel, not MDF. Consistent clamping force at all mounting points, no stripping under sustained 1,500-watt operation.

Wiring

Proline X Terminal Cup: Pre-Wired with 12g OFC


The Proline X terminal cup is installed and pre-wired with 12-gauge OFC internally. Connect your amplifier run to the terminal and mount the driver. ResoNix recommends 10-gauge speaker wire from terminal to driver at 1Ω loads to maintain damping factor. Factor this into your wiring plan.

Cutout

Direct-Fit: Machined for the GUS-15


The baffle cutout is machined to the GUS-15's mounting diameter. The driver seals against its included rubber mounting ring gasket and mounts to the threaded inserts, no shimming, trimming, or gasketing tape required.

Configuration

Front-Firing or Downfiring: Feet Included


Rubber feet for downfiring installation are included. The GUS-15's vented rear cone assembly allows the pole vent to be fully obstructed without acoustic penalty. Downfire in a tight install is viable. ResoNix notes minimal real-world difference between orientations; choose based on install practicality.

Acoustic

Polyfill Pre-Installed


Polyfill is factory-installed. It acoustically dampens internal panel reflections without artificially altering volume. Factory installation ensures consistent packing density across every unit.

Reinforcement

Dowel-Reinforced Stack Fab, 1,500W Structural Standard


Dowels throughout the stack-fab assembly add mechanical alignment and shear resistance at panel joints independent of adhesive condition. At 1,500 watts RMS the lateral and outward forces on panel joints are the highest of any single-driver build in this series. stack-fab construction + adhesive + dowels: all three systems working together.

Ready to Mount. Ready to Wire. Built for Active Systems.

The enclosure ships fully prepped. The Proline X terminal cup is installed and pre-wired with 12-gauge OFC. Connect your amplifier run and wiring is complete. The double-layer baffle uses 8/32 threaded inserts with stainless machine screws included. Rubber feet for downfiring are included. Polyfill is factory-installed. Minimum front clearance for the GUS-15 is 33mm. Confirm this against your install location before mounting.

Impedance Options: D2 and D4

The GUS-15 is available as a Dual 2-ohm (D2) and Dual 4-ohm (D4). D2 T/S parameters are not yet finalized by ResoNix. D4 data is published and is the basis for this enclosure's volume calculation. Wire the D4 parallel for 2 ohms, series for 8 ohms. Wire the D2 parallel for 1 ohm, series for 4 ohms. At 1 ohm, use an amplifier explicitly rated for sustained 1-ohm operation. At 2 ohms, target a monoblock delivering 1,000–1,500 watts RMS. Do not exceed 1,500 watts RMS. ResoNix is explicit that overpower damage is not covered under warranty.

Where It Fits

At 28" × 17.5" × 8.25" and roughly 40+ lbs, this is the largest enclosure in the Micro Series. The 8.25" depth is what makes it viable in locations a conventional 1.35 cu ft sealed 15" box, typically 14–18" deep, cannot reach. Measure carefully before ordering:

  • Trunk floor: full-size sedans, sport sedans, wagons
  • Flat cargo floor: mid-size and full-size SUVs
  • Behind-seat: full-size crew cab trucks with rear seat removed
  • Under rear bench: full-size SUVs and vans
  • SQ competition builds, where depth is the constraint and output is the goal
  • High-output daily builds: systems targeting maximum extension
2-Year Warranty

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. Internal volume, cutout geometry, baffle layer count, dowel placement, and terminal positioning are all held to spec on every unit. Langboard Elite MDF throughout: named, mill-documented, published density and bond specifications.

Specifications
Compatible DriverResoNix GUS-15 (D2 / D4)
Enclosure TypeSealed
Internal Volume (Net)1.42 Cubic Feet (1.35 target + 0.072 driver displacement)
MaterialLangboard Elite 3/4" MDF
ConstructionCNC-Cut Stack Fab / Dowel Reinforced
Front Panel Thickness1.5 Inches (Double-Layer Stack Fab)
External Width28 Inches
External Height17.5 Inches
External Depth8.25 Inches
Corner Geometry3" Radiused on All Four Corners (Standing Wave Control)
Woofer Opening356.17mm Direct Fit for ResoNix GUS-15
Min Front Clearance33mm (per ResoNix specification)
Magnet ReliefPrecision-Milled for Volume Adjustment and Voice Coil Cooling Airflow
Driver Mounting8/32 Threaded Inserts. Stainless Machine Screws Included.
Terminal CupProline X ABS/Carbon Fiber. Stainless Hardware. Copper Ring Terminals. Pre-Wired.
Internal Wiring12-Gauge OFC (Oxygen-Free Copper)
PolyfillPre-Installed
Firing DirectionFront-Firing or Downfiring
Downfire FeetIncluded
FinishPlush Black Automotive Carpet
Design Revision5.20.26
Warranty2 Years. Proline X / Audio Intensity.
Made InTullahoma, Tennessee, USA
Performance Graphs
Net airspace
1.35
cu ft per chamber
System Qtc
0.69–0.70
sealed
Half power
32.2–35.6
Hz · F3
Xmax at
1590
W RMS · no filter
With 25 Hz subsonic
3025
W RMS · +90%
Amplifier
1500
W RMS recommended
This enclosure holds 1.35 cu ft net per chamber. In it the ResoNix GUS-15 runs a system Qtc of 0.69–0.70 with half power at 32.2–35.6 Hz, and the cone reaches its 25.0 mm travel limit at 1590 W, above the driver’s 1500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 3025 W — +1435 W, or 90 percent more power for the same 25.0 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 44.1–50.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D4 50.3 D2 44.1
D4 · EBP 50.3D2 · EBP 44.1
The GUS-15 straddles the boundary at 44.1–50.3 depending on coil — part sealed-band, part transition. Either way it takes a sealed load happily; the coil you run shifts the alignment more than it shifts this verdict.

02What the box does to it

1.35 cu ft against a 117.5 L Vas.

α = Vas ÷ Vb = 3.07  ·  Fc = Fs√(α+1) = 32–35 Hz  ·  Qtc = 0.69–0.70
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D4 · Qtc 0.69, Fc 35 Hz, F3 35.6 HzD2 · Qtc 0.70, Fc 32 Hz, F3 32.2 Hz
The box lifts resonance from 17.1 Hz free-air to 32–35 Hz and half power lands at 32.2–35.6 Hz, anechoic, before any cabin gain. This enclosure ships without a driver, so both coil variants the maker offers are plotted. They do not load the same box the same way.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 25.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 1590–1720 W unfiltered  →  3025–3057 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 25.0 mm 1590 W reaches Xmax here
D4 · 1720 W, no filterD2 · 1590 W, no filterD4 · 3057 W with subsonic at 25 Hz, 24 dB/octD2 · 3025 W with subsonic at 25 Hz, 24 dB/octXmax 25.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 25.0 mm. Unfiltered that is 1590 W, reached first at 20 Hz. It sits above the 1500 W the driver can take thermally, so the voice coil gives up before the suspension does. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 3025 W before hitting the same 25.0 mm. That is 90 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs17.11Hzfree-air resonance
Qts0.340 / 0.310D4 / D2
Vas117.47 / 157.94Lequivalent compliance
Sd804.2cm²effective piston area
Xmax25mmone-way linear travel
Pe1500Wcontinuous RMS
SPL84.2dB1 W / 1 m, derived from T/S

Driver parameters as published by resonixsoundsolutions.com. Curves computed against this enclosure’s actual net airspace.

Materials
Material

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.

Specifications

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
Internal Bond

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.

Stiffness

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 is what keeps a Micro Series wall from moving. Every wall is a stack of CNC-cut layers rather than a single unsupported panel, with dowel reinforcement running between the layers as tension hardware. There is no wide unsupported span left to flex and no butt joint to work loose, so resonance is controlled at the structure level, not the panel level. The bass you hear comes from the driver, not the box.

Screw Holding

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. On a Micro Series enclosure the driver never threads into raw MDF. The baffle carries 8/32 threaded inserts set into its back face, so the woofer mounts on machine screws into steel threads. Face and edge screw holding still matter for everything else that fastens into the shell, including the terminal cup and the included down-fire feet. 325 lb face screw holding strength means those fasteners stay seated under vibration instead of backing out and opening an air leak.

Sourcing

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.

Frequently Asked Questions

Does this enclosure include the ResoNix GUS-15 subwoofer?

Why does this enclosure list 1.42 cubic feet when ResoNix recommends 1.35?

What makes the GUS-15 different from the GUS-12 in terms of output?

How does the GUS-15 sound in a vehicle cabin at 1.35 cu ft?

What amplifier does the GUS-15 require?

Why does this enclosure use dowel reinforcement?

Can I run this downfiring?

Where is the Proline X Micro Series 15" enclosure built?

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