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Alpine in Proline X Micro Series Enclosure

Proline X

Proline X Micro Series 10" Sealed Enclosure - Fits Alpine RSW10

Q: Alpine publishes a 0.54 cu ft sealed target. Why does this enclosure run 0.50?

Alpine publishes three sealed volume targets for the RS-W10D4 ranging from 0.54 to 1.04 cubic feet. This enclosure delivers 0.50 cubic feet. Slightly below the smallest published target. The RS-W10D4 has a high Qts of 1.19, which means its system Qtc in any sealed enclosure will be elevated above neutral. At 0.50 cubic feet the Qtc is slightly higher than at 0.54, which produces a warm, upper-bass-forward response that suits daily-driver installs where impact and efficiency at listening volumes matter more than deep anechoic extension. The real-world difference between 0.50 and 0.54 cubic feet with this driver is not audible in a vehicle cabin. The larger volume targets Alpine lists (0.79 and 1.04 cu ft) provide deeper extension but require enclosure depths incompatible with the Micro Series format.

Q: What does a high Qts of 1.19 mean for how this driver sounds?

Qts is a measure of total system damping. A high Qts means the driver is lightly damped. It produces a naturally elevated low-frequency response in a sealed enclosure before rolling off, rather than rolling off flat at the box resonance. In practical terms, the RS-W10D4 in a compact sealed box produces warm, impactful bass with strong output in the 50–80 Hz range that most listeners associate with impactful daily-driver sound. It does not require DSP to produce a pleasing in-cabin response the way a low-Qts SQ driver does. This is a deliberately different character than the JL TW3 or Wavtech thinPRO builds in this series. Both of which have lower Qts values and flatter sealed responses.

Q: Will this fit behind or under the seat of my truck?

At 5.25" total depth, 21.5" wide, and 14.5" tall, this enclosure fits behind the seat in most full-size crew cab and extended cab trucks including the Ford F-150, F-250, Silverado, Sierra, Ram 1500, and Ram 2500. It also fits under the rear seat in many extended cab configurations. Seat floor clearance varies by model and trim. Measure the available depth at both the front and rear of the install location before purchasing.

Q: How do I wire the RS-W10D4's dual 4-ohm voice coils?

The RS-W10D4 has two separate 4-ohm voice coils. Wire both coils in parallel, connect positive to positive and negative to negative across both coils, to present a 2-ohm load to your amplifier. Wire both coils in series, connect the positive of one coil to the negative of the other, then use the remaining terminals as your output, to present an 8-ohm load. Most builds run parallel at 2 ohms into a 2-ohm-stable monoblock. Confirm your amplifier's minimum stable impedance before wiring.

Q: What amplifier power does the RS-W10D4 require?

The Alpine RS-W10D4 is rated at 600 watts RMS with a recommended amplifier range of 300–600 watts RMS. For the D4 wired to 2 ohms, a monoblock stable at 2 ohms in the 400–600 watt RMS range is the practical target. The RS-W10D4's high Qts and neodymium motor system produce audible output even from moderately powered amplifiers. It is a forgiving driver to match. Do not significantly exceed 600 watts RMS at the final impedance to avoid thermal damage.

Q: Can I run this enclosure downfiring?

Yes. Rubber feet for downfiring are included. No additional hardware required. The RS-W10D4 uses a standard round flange that seals cleanly against the baffle gasket in either orientation. Downfiring in truck cab installs couples bass output with the vehicle floor, which reinforces the low-frequency response and works particularly well with the RS-W10D4's warm, upper-bass-forward character in this enclosure size.

Q: What makes this enclosure different from a generic thin-box enclosure for the RSW10?

Generic thin enclosures for the RS-W10D4 are built to approximate internal volumes without controlled tolerances, assembled with single-layer panels and glue-only joints, and sold as universal fits across multiple driver models. This enclosure is machined to the RS-W10D4's specific cutout geometry, built to a controlled 0.50 cubic foot net volume, and uses double-layer stack-fab Langboard Elite MDF panels reinforced with dowels and dado joinery throughout. The Proline X terminal cup is pre-wired with 12-gauge OFC internally. Threaded inserts rather than wood screws mount the driver. Every structural element is built to hold its geometry and acoustic seal under 600 watts RMS for the life of the installation.

Q: Where is this enclosure built?

Every Proline X enclosure is CNC-cut and hand-assembled in Tullahoma, Tennessee on ShopSabre CNC routers. Langboard Elite MDF is used throughout, a named, mill-documented panel with published density, internal bond, and screw-holding specifications. Internal volume, cutout geometry, dado joint depth, baffle layer count, dowel placement, and terminal positioning are all held to spec on every unit. Proline X is the enclosure brand owned and manufactured by Audio Intensity.

SKU: M10-S ALP

QUICK SPECS

Best For: Daily-driver installs, under-seat and behind-seat trucks, tight trunk and cargo builds
Power: Rated for up to 600W RMS (Alpine RS-W10D4)
Topology/Class: Sealed / Double-Layer Stack Fab / Dowel Reinforced / Front-Fire or Downfire
Sonic Character: Warm, impactful daily-driver bass. High-Qts driver delivers strong upper-bass presence in a 5.25" compact sealed build

Shipping Included Shipping is included on orders to the lower 48. No freight charges at checkout. Alaska, Hawaii, and international orders are quoted live rates at checkout.

USA Built Handcrafted in Tennessee

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware.

$ 249.99

Financing available. Choose Shop Pay Installments at checkout.

In Stock and Ready to Ship

Proline X Micro Series 10" Sealed Enclosure - Fits Alpine RSW10

$ 249.99

INSTALLER'S TAKE

The Alpine RS-W10D4 is a fundamentally different driver than the JL TW3 and Wavtech builds in this series, and the acoustic story in this enclosure reflects that. A Qts of 1.19 is high. Well above the 0.4–0.7 range of the SQ-oriented drivers in this lineup. High Qts in a sealed enclosure means the driver produces a naturally elevated Qtc, which translates to a warm, punchy bass character with strong efficiency in the 50–80 Hz range. This is not a driver that needs DSP to sound good in a compact sealed box. It is a daily-driver built to hit hard and sound full at volume.Alpine's published sealed volume targets for the RS-W10D4 are 0.54 cu ft (-3dB at 32 Hz), 0.79 cu ft (-3dB at 30 Hz), and 1.04 cu ft (-3dB at 28 Hz). This enclosure runs 0.50 cu ft. Just below the smallest published target. In acoustic terms, this pushes the effective Qtc slightly higher and shifts the -3dB point upward by a small amount. In practical terms, the difference between 0.50 and 0.54 cu ft in a daily-driver compact install is not audible. The bass will be warm, impactful, and efficient at volume. If you want the deeper anechoic extension of the larger volume targets, those enclosure sizes are not compatible with the Micro Series depth constraint, and the RS-W10D4's high Qts means the upper-bass impact in this 0.50 cu ft build is the driver doing exactly what it was designed to do.

Overview

Micro Series | Alpine RS-W10D4 | Enclosure Only

Built for the Alpine RS-W10D4.
0.50 cu ft. 5.25" Deep.

The Alpine RS-W10D4 is a high-Qts shallow-mount driver. 600 watts RMS, 20mm Xmax, and a Qts of 1.19 that makes it forgiving in compact sealed enclosures and naturally impactful in daily-driver applications. The Proline X Micro Series enclosure delivers 0.50 cubic feet of sealed airspace in a double-layer stack-fab build that is 5.25 inches deep, the same shell as the JL 10TW3 build, matched to the Alpine's specific cutout geometry.

0.50 Cu Ft Net Volume

5.25" Total Depth

1.19 Driver Qts

600W Driver RMS Rating

Enclosure only. The Alpine RS-W10D4 subwoofer is not included. This enclosure is designed for customers who already own or are separately purchasing the RS-W10D4.

High-Qts Driver, Compact Sealed Box: What That Actually Means

The Alpine RS-W10D4 has a published Qts of 1.19, one of the highest in the Micro Series lineup. A high Qts in a sealed enclosure produces an elevated system Qtc, which means the driver's low-frequency output rises gently before rolling off rather than dropping flat at the box resonance. At 0.50 cubic feet, the RS-W10D4's system Qtc will be well above 1.0, which produces a warm, impactful bass character with good efficiency in the upper bass range.

Alpine publishes three sealed volume targets for this driver: 0.54 cu ft for a -3dB point at 32 Hz, 0.79 cu ft for -3dB at 30 Hz, and 1.04 cu ft for -3dB at 28 Hz. At 0.50 cubic feet this enclosure falls just below the smallest published target, which shifts the effective extension point slightly upward in exchange for maximum output efficiency in the 50–80 Hz range. For a daily-driver under-seat or behind-seat install, this is the practical tradeoff, a compact box that punches hard where the listener feels it most. If deeper anechoic extension is the priority, the larger published volumes require a box this format cannot deliver.

Double-Layer 1.5" Baffle, Stack Fab, Dado Joinery, Dowel Reinforced

The front baffle is a double-layer stack-fab build, two CNC-cut Langboard Elite MDF panels bonded to 1.5 inches total thickness. At 600 watts RMS and 20mm Xmax on a 10" cone, the baffle carries a sustained mechanical load that a single 3/4" panel will resonate under over time. Two bonded layers eliminate baffle resonance at the structural level. The stack-fab assembly is further reinforced with dowels throughout, adding mechanical alignment and shear resistance at every panel joint beyond what dado joinery and adhesive alone provide.

Every panel joint uses CNC-cut interlocking dado slots, mechanical interlock before adhesive, adhesive seal after. The 5.25-inch total depth is the same shell geometry as the JL 10TW3 enclosure, with the baffle machined to the Alpine's specific cutout diameter rather than the JL's tab-ear geometry.

Volume

0.50 cu ft: Compact and Output-Efficient

At 0.50 cubic feet, the RS-W10D4's high Qts produces a warm, elevated Qtc that maximizes output efficiency in the upper bass range. Alpine's smallest published sealed target is 0.54 cu ft, this enclosure lands just below, producing a slightly elevated Qtc that suits daily-driver impact-focused installs.

Depth

5.25" Total: 3.25" Driver Clearance with Margin

The RS-W10D4 requires 3.25" of mounting depth. The enclosure provides sufficient clearance for the driver's rear motor structure at full excursion. At 5.25" total depth this enclosure fits behind and under seats where conventional 10" sealed boxes cannot.

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 600 watts RMS, baffle resonance at the panel level adds coloration. Double-layer construction with dowel reinforcement eliminates it.

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 RS-W10D4 mounts to steel, not MDF. Consistent clamping force, no stripping risk, and clean driver reinstallation when service is needed.

Wiring

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

The Proline X terminal cup is installed and pre-wired with 12-gauge OFC run internally to the driver location. Connect your amplifier run to the terminal and mount the driver. No internal wiring work required.

Cutout

Direct-Fit Alpine Geometry: Standard Round Flange

The RS-W10D4 uses a standard round mounting flange. The baffle cutout is machined to the Alpine's specific cutout diameter, the driver seats flush, seals against the gasket, and mounts to the threaded inserts without shimming or modification.

Configuration

Front-Firing or Downfiring: Feet Included

Rubber feet for downfiring installation are included. Run it front-firing in a standard orientation or flip it downward to couple bass output with the vehicle floor. Downfiring is effective in truck cabs and SUVs where floor coupling enhances the perceived bass response.

Acoustic

Polyfill Pre-Installed

Polyfill is packed and installed at the factory. It acoustically increases the effective internal volume, extending low-frequency output without adding external size. Factory installation ensures consistent packing density across every unit.

Reinforcement

Dowel-Reinforced Stack Fab: Mechanical Strength at Every Joint

Dowels throughout the stack-fab assembly add mechanical alignment and shear resistance at panel joints independent of adhesive condition. Combined with dado joinery and adhesive, every joint in this enclosure is locked by three independent mechanical systems.

Ready to Mount. Ready to Wire. Ready to Downfire.

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 already factory-installed.

Impedance Options: D4 Wiring

The RS-W10D4 has dual 4-ohm voice coils. Wire the two coils in parallel for a 2-ohm load, or in series for an 8-ohm load. Most builds run parallel at 2 ohms into a 2-ohm-stable monoblock in the 400–600 watt RMS range. Confirm your amplifier's stable impedance before wiring. The RS-W10D4's high Qts means it will produce audible output even when moderately underpowered. It is a forgiving driver to match.

Where It Fits

At 21.5" × 14.5" × 5.25", this enclosure fits in the same tight installations as the JL 10TW3 version of the same shell. Common placements:

Under-seat: extended cab and crew cab trucks
Behind-seat: full-size truck cabs (front-firing or downfire)
Trunk corners: compact and mid-size sedans
Side cargo panels: SUVs and crossovers
Hatch floor: sports cars and hatchbacks
Spare tire well: select SUV and crossover platforms

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, dado joint depth, 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 Driver	Alpine RS-W10D4 (Dual 4-Ohm)
Enclosure Type	Sealed
Internal Volume (Net)	0.50 Cubic Feet
Material	Langboard Elite 3/4" MDF
Construction	CNC-Cut Stack Fab / Dado Joinery / Dowel Reinforced
Front Panel Thickness	1.5 Inches (Double-Layer Stack Fab)
External Width	21.5 Inches
External Height	14.5 Inches
External Depth	5.25 Inches
Max Mounting Depth	3.25 Inches
Woofer Opening	Direct Fit: Alpine RS-W10D4
Driver Mounting	8/32 Threaded Inserts: Stainless Machine Screws Included
Terminal Cup	Proline X Terminal Cup: Pre-Wired
Internal Wiring	12-Gauge OFC (Oxygen-Free Copper)
Polyfill	Pre-Installed
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

Performance Graphs

Net airspace

0.50

cu ft per chamber

System Qtc

1.49–1.94

sealed

Half power

32.9–34.1

Hz · F3

Xmax at

998

W RMS · no filter

With 25 Hz subsonic

1005

W RMS · +1%

Amplifier

500–600

W RMS recommended

This enclosure holds 0.50 cu ft net per chamber. In it the Alpine RS-W10D2 runs a system Qtc of 1.49–1.94 with half power at 32.9–34.1 Hz, and the cone reaches its 20.0 mm travel limit at 998 W, above the driver’s 600 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 1005 W — +7 W, or 1 percent more power for the same 20.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 18.7–27.0

D2 · EBP 27.0D4 · EBP 18.7

EBP under 50 means a motor that wants a sealed load. The RS-W10D2 sits at 18.7–27.0, inside that band, which is why this is a sealed build rather than a ported one.

02What the box does to it

0.50 cu ft against a 20.6 L Vas.

α = Vas ÷ Vb = 1.46 · Fc = Fs√(α+1) = 47–50 Hz · Qtc = 1.49–1.94

D2 · Qtc 1.49, Fc 47 Hz, F3 32.9 HzD4 · Qtc 1.94, Fc 50 Hz, F3 34.1 Hz

The box lifts resonance from 30.0 Hz free-air to 47–50 Hz and half power lands at 32.9–34.1 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 20.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 998–1011 W unfiltered → 1005–1028 W with a 25 Hz subsonic

D2 · 1011 W, no filterD4 · 998 W, no filterD2 · 1028 W with subsonic at 25 Hz, 24 dB/octD4 · 1005 W with subsonic at 25 Hz, 24 dB/octXmax 20.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 20.0 mm. Unfiltered that is 998 W, reached first at 47 Hz. It sits above the 600 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 1005 W before hitting the same 20.0 mm. That is 1 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	30.00	Hz	free-air resonance
Qts	0.950 / 1.190		D2 / D4
Vas	20.64 / 23.35	L	equivalent compliance
Sd	380.0	cm²	effective piston area
Xmax	20	mm	one-way linear travel
Pe	600	W	continuous RMS
SPL	78.9	dB	1 W / 1 m, derived from T/S

Driver parameters as published by Alpine R-Series Shallow application guide. 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.